Normal for me.

Usually just go for normal my first playthrough. IF I like it enough I'll go through it on a harder one like Halo 5 I'm going through on legendary right now

You should try Grounded if you ever have the chance. While enemies still retain their unlimited ammo bullshit thing (and there's even a bigger deficit on your end), you have your HUD removed and humans die in one or two shots (depending on where you hit), like in real life. It happens to Joel and it happens to its foes. You get shot, you die. They get shot, they die. It's a matter of who shot first, and it's intense that way. :P

It _Really_ depends on the game. There are a very small handful of games where starting on anything but the easiest difficulty will likely piss you off, and make you quite not long after starting the game (Stalker). For games like that, I always go with easiest difficulty and work my way up.

For almost all other IP, I'll usually start at Hard, and then proceed onto the harder difficulties (if they're unlockable).

Normal most times. I've nothing to prove and just wanna have fun when I play

I always start the games on Normal, and I complete them again on Hard. When I got the Uncharted Collection, I started each game on Hard since I completed them already on the higher difficulties on PS3.

Normal, here to have fun not be stressed out, unless it's Tekken, that goes straight to Ultra Hard because it's kinda easy.

I usually go with normal.

Easy or normal.
Hard when I replay it and feel confident.

Used to be normal. Last gen I changed to one above Normal.