PocketBand Lite is an amazing DAW for Android that lets friends collaborate on tracks from their phones using cloud based technology. Even if you aren't collaborating, PocketBand has a ton of features that allow users to make great sounding tracks.
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Pro Customize synths
You can adjust the synths that are pre-loaded in order to make them match the sound you want
Pro Record live audio
Most DAWs don't let you record your own audio, but this one does.
Pro Get feedback on your tracks
PocketBand Lite allows users to comment and vote on other musicians' tracks.
Pro Wide range of instruments
In total, there are 61 synth instruments or 197 if you buy the full version.
Pro Lets you collaborate
You are able to send a song to a friend or someone you have never met. The song can be sent around endlessly!
Con Costs $4.99
This app isn't free - but it is definitely one of the best options out there.