How to Buy the Perfect Fitness Tracker

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

Apple Watch Sport ($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. 

Basis Peak ($200)

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

Fitbit Charge HR ($150)

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

Garmin Vivo­-Active ($250)

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

Garmin Vivofit 2 ($100)

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

Lumo Lift ($80)

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

For Weekend Warriors

Fitbit Surge ($250)

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

Moov Now ($100)

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

Polar M400 ($230)

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

TomTom Runner Cardio ($230)

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

Wahoo Tickr X ($100)

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

For Aspiring Pros

Athos ($150 and up)

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

Garmin Forerunner 920XT ($450)

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

Garmin Vector 2 pedals ($1,500)

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

Recon Jet sunglasses ($499)*

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

Spire ($150)

The Good: The rare wearable that tells you what to do with all the information. 
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.