well, Titanfall is essentially a source engine game (although the engine is heavily modified), so i'm a bit annoyed there isn't native linux support - but afaik all source engine games do well through proton (this includes apex legends, but EAC is its only undoing).
i've never played it on windows, so i can't give you a 100% answer. i've never had any issue with it, and i don't think you'd be able to tell it wasn't a linux native game.
Noticed any difference between Windows and Linux for that particular game?
It's on the list of my most played games so making sure it runs properly is really important for me to make the switch ^^