Yeah, no other difference other than a slightly more battery drain and better performance. I just have my smooth display just turned on because I want the best battery life out of my phone I can possibly get.
Am running my 5 on forced 90hz,no probs, still getting great battery life
How long is your battery lasting with 90 hz forced on? Also another way I found you can save battery life which I've been doing is to turn off always on ambient display...
Update: so I did turn 90 hz refresh rate on my phone off just to test out if I could tell the difference between hz, and 90 hz. With 60 hz I can feel the choppiness. I do notice that 90 hz a little bit more so. Honestly just thought I'd share my thoughts! Again since I'm so uptight slashing all about battery life, I would never force 90 hz on fully, but it's a nice before and after to test out.