Which game should i play first?

I haven't played any of these but from what I've seen Rise of the Tomb Raider looks like a lot of fun. Sorry if that doesn't help. It kind of reminds me a bit of Witcher 3. Also, those are great wins.

You need one of these:

View attached image.

Anything but AC i guess

Crusader Kings II

I completed Rise of the Tomb Raider and Black Flag. Both are awesome.
Tomb is more casual though. and takes way less time to complete.

Mad Max and WD I have played less than 5h myself. Didnt like them much.

Rise of the Tomb Raider: Good game, good story, great graphics. Becomes a bit grindy from time to time to get the resources you want, but that's it.
Mad Max: Terrible game... Bad story and not very interesting to keep playing for a longer time. I didn't even bother to finish it.
Assassin's Creed IV Black Flag: Nice game, but exactly the same as all the other Assassin's Creed games. I still prefer the first one.
Watch_Dogs: Meh... Sounded like a great game, but within an hour it becomes very repetitive.

Watch_Dogs, so that you won't be spoiled by better games before playing it :3
Or Rise of the Tomb Raider, since you recently played (and apparently finished) Tomb Raider (2013 reboot).

Watch Dogs or Mad Max first.
Then AC4
And the best one last, Rise of the Tomb Raider.

AC4 is the best of the group by far. The Assassin's Creed parts are kinda shit but the naval battles are fantastic.

Rise of the Tomb Raider is like its predecessor but not as good unfortunately.

The other two are typical open-world collectathon chore list games.

mad max is awesome, go for it

View attached image.