When comparing Fitbit Flex vs Apple Watch, the Slant community recommends Apple Watch for most people. In the question“What are the best fitness trackers that pair with iPhones?” Apple Watch is ranked 6th while Fitbit Flex is ranked 12th. 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 Replaceable wristband with lots of style options available
The fitness tracker itself is a separate part from the wristband that can be taken out and put in a different band. There is 10 wristband colors to choose from in the official store, and custom bands available from third-party vendors.
Pro Comprehensive reports of your daily activities
The fitness tracker offers stats such as distance traveled, steps taken, calories burned, weight changes, calories consumed from foods and drinks, restless and awake states of sleep, etc.
Pro Integrates with over 40 apps so you can get the info that's most important to you
The fitness tracker can be integrated with a variety of apps that together can offer more in-depth and complete overview of your health and fitness patterns.
Pro Visually displays your daily progress using LED lights
There are 5 LED lights that, after double-tapping the wristband, display progress towards a goal. Each light indicates 20% progress towards the goal and the tracker allows choosing between steps, calories or distance to display this way.
Pro Tracks weight goals
Fitbit Flex lets users create a meal plan and log their progress from the dashboard menu.
Pro 5-7 day battery
Fitbit Flex will last up to a week on a single charge.
Pro Real-time Bluetooth syncing
Flex constantly shares data over Bluetooth, meaning that the device doesn't need to be taken off in order for the data to sync to an iOS or Android device.
Pro Social layer can increase motivation
Information regarding goals and progress can be shared with friends, and users can even challenge each other with goals.
Pro Quick food and drink logging
Because of Fitbit's database of foods' nutritional information, food and drink logging is easy.
Pro Comfortable
The lightweight rubber band is very comfortable to wear.
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 Oversensitive pedometer overestimates your step count
The fitness tracker's step counter often counts movement unrelated to walking or running as steps. It ends up reporting more movement than has actually happened.
Con Hard to get the tapping right to active LED display
The double tap to activate the LED display lights must be the appropriate pressure and timing in order for it to work correctly. This can be frustrating to some users.
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).