I've just never been on board with the praise that the Forever suit gets. Hate the gloss, hate the nipples, hate the dozens of little Kelley Jones style ab muscles. The mask is okay but it's brought down by Kilmer's derp face. Symbol is cool. 
 
I don't love any of the suits. Returns is the best by default, because it eschews the silly fake muscle look for armor that actually looks like armor and the cowl is fantastic and fits Keaton's face better than any actor/cowl combo in the series. It's still got problems inherent in being a rubber Batsuit. 
 
Forever suffers from the problems above, 89 I just never liked at all - it's only saved by the way it's lit and shot, B&R is as bad as Forever but BLUE (no need to say anything about the sonar or ice suits), Begins is teh puffy, just looks too soft to be armor, and TDK is overdesigned and problematic, though admittedly I think it works better than the others save Returns, despite it's disappointing cape and a cowl that looks silly from certain angles. 
 
Best Overall: Returns
Best Armor: Returns
Best Cowl: Returns
Best Cape: Begins
Best Movement: TDK
Best Symbol: Forever