Stats almost always. I wish more games had it like DC Universe Online did where once you got equipment you unlocked the look so you could keep the look and change gear.Honestly, I just wish they'd go back to the days where equipment was JUST stats. A handful of more recent games do this but for the most part the armor is visible.
Depends on the game I guess but overwhelmingly function.
If the game is just super easy I might go for fashion. Maybe.
it depends on how effective the armor is. Dark Souls 2, gimmie fashion all day.
Looks don't win you games