Storing music and playing music from streaming apps are two entirely separate things. In terms of music storing capabilities, the best Garmin watch for this capability is either the Forerunner 645 or 945 models. Additionally, the Fenix series can also store music, with the Fenix 6 Pro Solar being one of the most innovative models in this line for storage. Apple music is also popular with Apple watches, and the ease to access Apple music is one of the hallmarks of the brand.