Legit, poweramp is the default answer to this if you have any concern about sound quality. Neutron is as good or better, sound wise, but it’s a hot fucking mess otherwise.

Gonemad is good, but the sound just isn’t as good, and the ui is meh. The developer, however, is one of the most responsive and cool people you’ll ever deal with.

Past that, and you’re really just picking began your preferred ui. There’s stuff like jet audio, or usb player pro that have niche features, and work fine when you’re using an external DAC. But they aren’t going to do as much on average.