Far Cry 4 or assassin creed unity?

far cry 4 of course

do really want to play with unity on pc? o.O

Far Cry 4.

While Unity runs a lot better now, I'd have to say overall Far Cry 4 is the better game.
If you have to get an Assassin's Creed game, get Rogue.

If you've played farcry 3 then you have pretty much played farcry 4. That being said I enjoyed both very much. They are ways less obviously linear than assassins creed but that is just my personal opinion

Unity is pretty meh at best, really bad at worst... Far Cry 4 is just more Far Cry 3, and for some people thats enough.