I just came from Spotify and miss a few things but the integration with Apple products is really worth it. It's nice using Siri to lookup new music and the quality of the tracks seems better to me. I'm sure this is something to do with the way spotify normalised tracks. Give AM a trial, your mobile carrier may have one of those 'try for a few months for free' deals.
Really only keeping google music because of price but paying $2 more for Apple music worth it ? I find the app superior plus you get full integration with Apple products ( MacBook and iPhone)