I think Supernova damage reduced 93.8 Max HP. I wasn't thinking it's the easiest, cause I found FFX-2 to be way easy, the last boss is a dissapointment.
From Hardest to Easiest

Final Fantasy Tactics (The boss is hard)
Final Fantasy X (I hate the way to get sigil, a great pain in the ass )
Final Fantasy VII (I hate those damn weapons)
Final Fantasy VIII (My friend told me it's hard)
Final Fantasy IX (Good Character and stroyline but lame difficulty)
Final Fantasy x-2 (All the challenge are freakingly EASY)

I can't complain about FFVII-DC, FFXII, FFVI because I haven't finished it yet.