Thanks. I also have OnSong, Forscore, Bandhelper and Mobile Sheets Pro. And I don't think one app is really better than the others. Each app has some unique features that I really like. Stage Traxx does not want to compete with these apps. It has simply its own focus on being a music player first and foremost while the other apps are lyrics / sheet displaying apps foremost.
So in my opinion if your focus is on playback functionality, Stage Traxx is there for you 😃
If you primarily need plain text lyrics, go with OnSong.
If you need great PDF support, get Forscore on iOS or Mobile Sheets Pro on Android.
And if you need great setlist management for a whole band, take a look at Bandhelper.