Best cheap SSD in terms of reliability?

You forgot the "none" option. 2,5" SSD are much better than a HDD in read/write speeds(3xfaster) but compared to M.2 NVME SSD they are slow and are even more expensive. My recommendation M.2 NVME 2 TB Gen4 for ~ 80 bucks from a reputable brand. If your motherboard doesn't have built in slots for NVME there are cheap PCIe add-in cards available.

I've been using the same Kingston UV400 for years with no problems. YMMV, but I've always found their products to be pretty reliable.

If your motherboard supports NVMe drives, there's lots of good cheaper options from Silicon Power, Crucial, PNY, and SK hynix. Arguably overkill for an OS, but I've been very happy with NVMe for gaming.

Why no Samsung?
Or Crucial?
I've had an Ssd in my old PC (Intel Core 2 Quad 2,4Ghz, P35 mobo, 6GB Ram, hardware from 2008) for 6 8 or more years and they've been totally reliable. Initially a Samsung 120GB for the OS (Win7, later 10), and then a Crucial 250 GB as a second drive for games etc.
And the Speed difference even on an old potatato is huge.
It's like selecting a track on a record player or on a CD Player.
Not only on boot-up but also in-game data streaming. At a certain point of increasingly complex games however my CPU was just too slow.
Anyway, btt:
From your candidates I'd stick to the WD ones. The others are rebrands or various parts from different manufacturers, also depends on the warranty rules in your country however.
Don't fall for the trap of thinking you need the absolute fastest ones in benchmarks. There's fast and very fast.
Just be aware that small capacity ones can be alot slower.
And 240 GB is really on the low side. If you want to play AAA titles you should go for at least 400GB.
My Win 10 partition on the new system already uses 160GB for the OS, Swapfile, Hibernation etc.
Edit: Concerning NVME or Sata. If the money is tight or the board doesnt support NVME, a SATA SSD is still mighty fast.

I'm not familiar with any of those SSDs you have listed(to be fair I basically go straight to Samsung ones(a 970 Evo Plus(a 480GB one is $40)). If you need Sata SSD over M.2 the 870 is roughly the same price for smaller storage sizes.

but you will notice a large bump in speed going to any form of SSD, going to a M.2 NVME drive though from a Sata SSD will be a much more marginal speed gain(I relatively recently upgraded from Sata to a M.2, boot time was reduced slightly and zone loading in path of exile had reduced slightly to(my ultimate goal, those who play know... those load times add up over time).

I would consider not getting anything smaller than a 480GB unless you only plan on having one big game installed at a time.

no cheap is good

Crucial MX500

Most of the ssd's on the list you gave aren't the best for OS, they're more suited for storage only. If you want to install an OS i would recommend the "Kingston KC600" or the "Crucial MX500". And if you have a bit more money you can go for the "WD Blue" you listed, or even the "Samsung 870 EVO". Or you can just forget SATA and go straight to M.2 NVME, they're better overall.

Cheap usually means crappy speeds - there is a reason why there are differences in prices.
I've personally stuck with Crucial and Samsung, but I've also used ADATA with good results.
240GB? You're wasting your time. 1TB is cheap as chips nowadays.

i use a Samsung 850 EVO 256 GB as my OS drive since 2015 (recently moved it to the new PC from old one) and it still works like a charm, just don't forget to check on TBW (TeraBytes Written) parameter when choosing a SSD ( i think i used up my resource by 25% only)

No one here can provide you with a right choice, unfortunately. You'll need to check speck, view tests and pray that the chosen SSD will lasts for long (though nowadays they serve much longer).

Without comparing brands as I've never had to, I can vouch for Kingston. I've had two "generations" of PCs with that brand of SSD and never had a failure. They are affordable and do a fine job.

Here's a comparison of some of the 480 GB options, you can easily add more comparisons as you see fit... use google translate if need be: https://tweakers.net/pricewatch/compare/338748;1728692;1657710;1813724;587767;768525/

Specs sheets are linked at the bottom.
The PNY CS900 seems to be the best value for money over here.

Check this database:
https://docs.google.com/spreadsheets/d/1B27_j9NDPU3cNlj2HKcrfpJKHkOf-Oi1DbuuQva2gT4/edit#gid=0

If the SSD is for the OS (main drive), select a unit with DRAM, they are faster and more reliable. I'd recommend Samsung and Crucial, and never less than 500 GB (1 TB or more recommended).

None of the SSDs from the poll has DRAM.

Whatever you do, don't buy Team Group SSD. I have so many regrets.

Crucial has been quite reliable for me. Check the MX series, if you'd like to. They had better warranty in place than Samsung for my region.

1. whatever you choose, make sure you have a backup image, it will surely fail, the question is when...so, be prepared, install HWINFO64 and monitor its' temps.
2. use a few metrics to apply - price/waranty, price/size, TBW, m.2 is always better than 2.5 sata, also it can be properly cooled, temp variations are killing those "drives", it puts them on immense pressure and PCB solder joints are failing, from room temp to +80C and back to room temp, etc.

I tried looking but I don't see you mention your motherboard or hint which Gen NVME drive your PC can handle

If the MB can only do Gen 3 and you aren't looking to update your whole PC in the next 2 years you are better of buying a Gen 3, in which case the WD Blue SN570 is a top Gen 3 performer and all round good deal.

I'm using the following two SSDs in my laptop (not a gaming rig):

• Transcend SSD220S, SATA III, 2.5" (TS480GSSD220S)
• WD Green, SATA III, M2 2280 (WDS480G2G0B).
  All have a capacity of 480GB, cheap and great for me.

You could also look for SK hynix, I have one at work. I think it's a M2 NVME.

Be wary of Silicon Power, they have cheap and premium product lines.
I used a cheap one in the past, and it failed abruptly after 3 years of service.

I've been using the Lexar NM620 and so far no issues, so that's one you might want to consider.

I bought Samsung, in my case there was not much difference in price but reliability of Samsung is i think better.

All I can say is all my drives are currently WD Blue. I've got a 1TB NVME, 2x 500GB SSD's and a 2TB SSD. The 1TB NVME and 2TB SSD are fairly new, not even a year old, but the 2x 500GB's I've been using since 2017/2018. According to the WD Dashboard, one is sitting at 96% health, and the other 99%. Whether or not that means anything, no clue, but yah, WD has never really failed me early on. Worst scenario I've had with WD was an HDD failing about 13 or 14 years ago, but it was a few years old.

Don't cheap out on SSD, otherwise you might regret longer term. They are not about just performance but also reliability, so if you pick some cheap trash you might one day wake up with lost data.

All I know is I wouldn't buy anything Western Digital again.

Avoid wd green if you can, it's cheap dramless drive that uses Sandisk controller that loves to just burn out (WD has bought Sandisk some time ago)
Also no dram and no hmb = almost slower than ssd when it's almost full (or perhaps it was almost dying, haha)
There are a lot of threads that mention WD Green Milpitas on the internet (lockout mode that is super hard to retrieve data back from)

Get at least 480Gb, smaller sizes are slower and you'll run out of space too fast. If you could post some links to shops you can purchase from and budget in your currency maybe we could have a look at what would be best.

If you are limited to SATA drives then TLC with DRAM cache would be best like the Samsung 870 EVO, Crucial MX500, SK Hynix Gold S31, SanDisk Ultra 3D. However, ANY SSD will be massively faster as a boot drive than an HDD. Out of just the ones you've listed I'd go for the Kingston A400 480Gb.

BTW, the OCZ/Toshiba Arc 100 you mentioned is really old (2014) and hasn't been made for years.

I guess prices are really bad in your country 😟 Here we can get the A400 / WD Green / Crucial BX100 480Gb for ~£20 (GBP).