I prefer medium
Can be lighter or harder when needed
That's me, too. However, I take notice of how hard is too hard and try to avoid that. All the rattling, etc. can sound like a crappy speaker, and my tone can go out the window like that. Yet, on a soft ballad, I find that I need to turn down a tad so as to be able to not have to play too light. I get better control when I can hit with a certain amount of pressure. Everyone's different on that, I know.