Normal. I am not an especially good gamer, but I like to know that I can at least finish the game as the more widespread difficulty.
I will admit though, that on the few games I played on hard- Kingdom Hearts: Birth By Sleep, for example, because you have to play on "proud" mode if you want the actual ending without getting 100% completion- and then on normal, I did enjoy the sense of superiority it granted me, as I destroyed every threat in a matter of hours.