There are only two areas where Google Play Music is significantly better than spotify:

1) It has a 10,000 free song library for non-premium users.

2) It has a completely editable queue.

In GPM/GPMAA, when I add a song or album to the Queue, it tacks it on to the end of the queue. As far as I know, that's how a queue works.

In Spotify, if I have started playing one album and I try adding another album, it injects the new album inside of the current album, immediately after the current track.

AC/DC Track 1 (currently listening)
Chicago Track 1
Chicago Track 2
...
Chicago Track 17
AC/DC Track 2

What gives there?

There's also another issue -- songs cannot be arranged once they are in the queue. So shuffling that misplaced queue album is an impossibility.