Other features also set Surge apart from Peak, such as built-in GPS for tracking your exercise routes. On this point, Basis said it has no immediate plans to include GPS tracking, but it pointed out that you can stream heart-rate data from Peak via Bluetooth to apps that use GPS for tracking.
Conversely, there are things Peak can do that Surge can't. For example, the Basis band is waterproof up to 50 meters, so you can wear it while swimming. Fitbit recommends removing the Surge before showering or swimming.
Ultimately, they're both worthy trackers for dedicated fitness buffs, but users should take heart-rate data collected during sweaty exercise with the proverbial grain of salt.
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