BFP has the better eye candy of the two mods but ESF has the better gameplay of the both and for an HL mod the eye candy of ESF is very impressive. Its Working its way to Quake 3 graphics unfortunatly the engines limits will prevent the graphics from increasing very much further.
I prefer ESF cause it has a more DBZ feel to it. Also BFP has a bunch of bugs. If ESF were on Quake 3 it would be the best out there. Well right now in my opinion it is the best out there cause it has no real competition. Once the melee is reworked so it has more flavor in it; it should surpass all rival mods.