Should I buy a used Garmin watch on eBay or a cheaper new fitness tracker?

Buy the used Garmin if you care about workouts; buy the cheaper new tracker if you want simple daily tracking and less risk.

• Used Garmin on eBay: Best for running, cycling, hiking, GPS, and training metrics. Older Garmins often still have strong battery life and better workout features than budget trackers. Main risk is battery wear and unknown condition.
• Cheaper new fitness tracker: Best for steps, sleep, and light everyday use. You get a fresh battery, no hidden wear, and usually a lower-risk purchase.

Rule of thumb

• Pick used Garmin if you want serious exercise tracking or built-in GPS for outdoor runs and hikes.
• Pick new budget tracker if you want small, simple, and reliable with less hassle.

Check before buying

• Battery life in real use, especially with GPS on
• Seller ratings and return policy
• Whether the model has built-in GPS or only phone-connected GPS

Bottom line: For fitness and training, used Garmin is usually the better value. For convenience and peace of mind, buy new.