Gotta pick from 5 games right now.
>The Surge
>XCOM 2
>Sniper Ghost Warrior 3
>Dishonored 2
>Sid Meier's Civilization VI: Gandhi's revenge
Which one and why.
Sniper Ghost Warrior 3 and The Surge are both garbage games from garbage producers that are nearly at shovelware tier.
So out of the three reasonable options I would go with XCOM 2. It has a wealth of content if you enjoy the genre and with Long War 2 it has even more features to keep you playing for much longer. Combined with how relatively simple it is to mod and tweak you can pretty much adapt the game to any mood you're in.