Here's an in-depth comparison of the Garmin Forerunner 245 vs. 255, plus advice on which to pick. Written by a marathoner and GPS watch nerd!
Garmin Forerunner 245 vs 255/255S Comparison — PlayBetter
Garmin Forerunner 255 First Run Review: What's new vs Garmin Forerunner 245?
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Garmin Forerunner 245 vs. 255: Should You Upgrade?
Upgraded from forerunner 245 to 265s : r/Garmin
Garmin Forerunner 245 vs Forerunner 255 – Is it worth the upgrade?
Garmin Forerunner 255 vs 245: how the two running watches compare
Garmin Forerunner 255 vs 245 vs 55 Comparison Which Running Watch Should You Buy? — PlayBetter
Garmin Forerunner 255 v 245: Which running watch is right? - Wareable