Which of these running watches has the edge?

Garmin has spent the last year or so refreshing its most popular running watchlines with music smarts and more – a move that has produced both the Forerunner 245 Music and Forerunner 645 Music.

Within the company’s full stable of GPS watches, the Forerunner 645 sits just above the Forerunner 245 in terms of price, though many of the latest features are present in the latter. As such, it can be a little hard to figure out which of these devices is actually better, and which represents the best value for your money.
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https://www.wareable.com/garmin/garmin-forerunner-245-music-vs-forerunner-645-music-7328