Which games should I get?

I think that CS has more replay value and u can get your money back eventually.

CS because in rust I hate to always have to rebuild everything because it is in alpha and there is a wipe too often :( (server wipe occur with updates). But they are way different games too...

CSGO is more fun for me.
Kinda tired tho so I don't feel like writing out why.

I voted RUST.
I enjoy shooters but CS:GO irked me in so many ways that I stopped playing it.
That and the community is terrible. Not very newbie friendly, and you constantly encounter hackers, spammers, and scammers.

What about experience in the previous series of Counter-Strike? Maybe, you don't like session shooter genre?

Whatever you plan to buy, I suggest you wait until there's a sale. Like spring sale. It'll be a small sale most likely, but Valve games usually always go on sale.

CS:GO pretty much always goes on a 50% sale. With $25 you can get them both.
+Summer is close

CS:GO is a very good game but if you have 25$ to spend, you should wait for the steam summer sales to get much more games for these 25$. ;)

Barbie

CS my ass, Rust of course.