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In our exhaustive investigation into the future of smart fitness, here are the 16 wearable devices we looked at—and who is best served by each.

For Casual Enthusiasts

 ($350 and up)

The Good: Integrates seamlessly with the iPhone’s communication functions; early-adopter street cred.
The Bad: Quick-draining battery; limited sports tracking.Ìý

Ìý($200)

The Good: Combines features like e-mail and phone calls with sleep and activity tracking.Ìý
The Bad: No GPS; black-and-white screen.

Ìý($150)

The Good: Adds heart-rate monitoring to Fitbit’s category-leading activity monitoring.
The Bad: No GPS, so no Strava glory.Ìý

Ìý($250)

The Good: Built-in ­features for specific sports, including golf.Ìý
The Bad: Do you really need a watch that tracks your handicap?

Ìý($100)

The Good: Can go a year without a charge.Ìý
The Bad: Limited to basic activity-monitoring features.Ìý

Ìý($80)

The Good: Wearable posture coach.Ìý
The Bad: Does what it says, but who wants to be nagged about posture?

For Weekend Warriors

($250)

The Good: Combines the features of an always-on fitness tracker with GPS and heart rate for logging workouts.Ìý
The Bad: Like all wrist-based heart-rate monitors, it can be inaccurate during workouts.Ìý

($100)

The Good: Hyper-detailed form analysis; affordable.Ìý
The Bad: Limited to accelerometer tech (i.e., no GPS or heart-rate monitor).Ìý

($230)

The Good: Combines ­activity monitoring, heart rate, and GPS tracking; cheaper than the com­petition.Ìý
The Bad: Lacks features like recovery and form analysis.

($230)

The Good: Simple to use; built-in heart-rate monitor.
The Bad: No ANT+ connectivity limits accessory choices.Ìý

($100)

The Good: Integrates sports tracking into a chest strap; watch not required.Ìý
The Bad: No screen means there’s no way to follow workouts in real time.Ìý

For Aspiring Pros

($150 and up)

The Good: Sensors ­embedded in clothing provide an exhaustive look at how your body is working.Ìý
The Bad: You’re locked into wearing their workout duds.Ìý

($450)

The Good: Aimed at triathletes, it syncs with cycling power meters and analyzes swimming form.Ìý
The Bad: No touch-screen.

($1,500)

The Good: Track power without limiting wheel or crank choice; can break numbers down by left and right leg.Ìý
The Bad: No MTB version. Cost more than a month’s rent.

($499)*

The Good: Displays data like power and heart rate in a convenient, always-visible spot.Ìý
The Bad: It looks like Google Glass’s meat-head older brother.Ìý

($150)

The Good: The rare wearable that tells you what to do with all the information.Ìý
The Bad: Being told you’re stressed when you already know you’re stres­sed is somewhat, uh, stressful.

*This article has been updated to reflect new pricing on the Recon Jet sunglasses.Ìý