When comparing Fitbit Charge vs Apple Watch, the Slant community recommends Apple Watch for most people. In the question“What are the best fitness trackers?” Apple Watch is ranked 18th while Fitbit Charge is ranked 26th. The most important reason people chose Apple Watch is:
Health apps downloaded on iPhone can be integrated with Apple Watch
Specs
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Pros
Pro Integrates social features
Users can see their friends' activity, compete one-on-one, and earn badges.
Pro Battery lasts a week or more on a single charge
The battery is rated for 7 days, and has been tested up to 9 days by reviewers.
Pro Multifunction display
In addition to fitness metrics, a Fitbit Charge synced with a phone will display time and caller ID.
Pro Smart alarm wakes you up at the optimal time
The Charge tracks sleep cycles, and its alarm can be configured to take this into account, attempting to select an optimal wake time.
Pro Works well with iPhone
Health apps downloaded on iPhone can be integrated with Apple Watch
Pro Haptic feedback for notifications
Pro Heart rate sensor
Pro First -rate app support
Pro Digital Crown
The Digital Crown allows you to zoom in and out with various applications and can be used as a button.
Pro Sensitive touch
Allows for taps and presses to be registered as two different types of input.
Pro Standalone phone calls
Series 3 can make and receive phone calls by itself, without the need to connect to a smartphone.
Pro Can unlock your Mac
If you have a Mac with sufficient Bluetooth chip support the Apple Watch can be used in place of your password or touch ID to login/unlock the system when in proximity.
Pro Customizable watch faces
Can customize the watch faces with "complications" such as weather forecast, traffic, meeting schedule, etc… or your own photos.
Pro Great fitness app support
The Apple Watch integrates with virtually every well-known fitness and calorie tracking app out there.
Pro Siri / Digital Assistant Support
You can use Siri directly from the Apple Watch, allowing you to call or text, but also to get directions, and more.
Cons
Con Flimsy two-prong wrist strap
Fitbit was expected to update their wrist strap with the Charge, but an upgraded buckle can only be purchased with Charge HR.
Con Expensive
Apple Watch is said to cost $349 USD.
Con Works only with iPhones
You need to have an iPhone (5 or later) to pair this smartwatch. It will not work with any other device, and has limited capabilities on its own (and still require the iPhone for the initial setup).