Prefer one piece. My backplate sometimes tugs my shirt up, but a one piece stays in place.
I pull the legs and arms inside out, put my foot through the opening and then pulling the suit on easy.
If you’d rather slide your leg through instead, put a plastic bag on your foot. It’ll slide easier. Just make sure to add a cave line to that bag and clip it to your regulator bag so it doesn’t blow away and cause more plastic pollution.
Getting a wetsuit off is still tough, but never as bad as putting it on dry. If you want really easy, get a shell drysuit.