It seems to have a better interface, but my priority is sound quality and a good EQ and in that aspect PowerAmp trounces the pants off of Player Pro from what I've seen. Everybody's ears are different and everybody needs/wants to EQ things differently, but for the punchy low end I want it's the best I've tried.
All of this is possible with one setting though... Direct Volume Control. I'm not sure if other players have it, but in PowerAmp you have to go to settings>audio>advanced tweaks and toggle DVC on. With this off it sounds like just another generic phone player that can't reach the lows I want. If you haven't tried PowerAmp with DVC then you haven't tried PowerAmp.