Which is better? GARMIN Forerunner 245 Music or GARMIN Forerunner 645 Music?

Which is better?

GARMIN Forerunner 245 Music

or

GARMIN Forerunner 645 Music

and they say they can Synchronize with KKBOX or Spotify® music streaming service. But if I use apple music, can I also Streaming media to download music simultaneously???