The UI just needs to be updated. They are on the right track with the Beta version but there are no themes in beta so you're stuck with the black and white, which just looks so dated.
Also, the tag editing is horrible in PowerAmp. You have to do one track at a time. With PlayerPro, you can do entire albums at a time. Plus, you can edit tags on the SD card. PowerAmp hasn't been updated in over a year. I feel like a paid app should have somewhat regular updates to keep up with the OS and be constantly improving the app. I've used PowerAmp since 2014 but had to leave it behind. I might go back if they update it soon.
As I said, the album artwork editing is so much better with PlayerPro. You also can have artist pictures for when you're browsing by artist. It just has a much more modern feel to it and while I've only been using it for about 4 months, I've already had a few updates in that time, which tells me that the developers are actually developing. Lol