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I just roll with the normal...the games are typically designed around that difficulty so you are playing as it was intended...
most harder difficulties just add HP to enemies and reduce player damage output....that often results in more frustrating gameplay instead of more difficulty
the way LO2 (and I think the first) handle it is a little different. Hard is similar to Normal but with scarcity of items. If you played stealth anyway then it won't be alot harder. If you fun and gun, it would be a lot harder due to lack of bullets. Survivor is way different. Even more scarcity but the key difference is awareness of enemies. You have to slow slow walk up on infected, clickers hear much better. And the biggest is humans. They have more peripheral vision. And if you hear the sound cue that you are getting in sight, if you don't hit the deck immediately you are spotted. You actually see them do a quick double take in your direction often. A couple of areas have more enemies as well. It will be interesting when I get to the bloater for Elie and the Hospital basement for Abby to see how that goes. Pretty much saving all bullets for that mess.
Im about to start the Ghost of Sushi tonight so hopefully I don't confuse myself with the controls if I'm doing both .