Fitbit VersaGarmin Vivoactive 3
Tech specs 
SizeDimensions: 39.35mm x 39.35mm x 11.24mm
Large: Fits wrists 180 mm - 220 mm in circumference
Small: Fits wrists 140 mm - 180 mm in circumference
43.4 x 43.4 x 11.7 mm
MaterialThe Fitbit Versa classic band is made of a flexible, durable material similar to that used in many sports watches, and includes an aluminum watch case and buckle.Case material: fiber-reinforced polymer and stainless steel
Lens material: Corning® Gorilla® Glass 3
Bezel material: stainless steel
ChargingUSBUSB
BatteryLithium-polymerRechargeable lithium-ion
Battery life4+ days. Charge time (0-100%): 2 hours.GPS mode: Up to 13 hours
Smartwatch mode: Up to 7 days
Water-resistance5 ATM5 ATM
Weight38 grams43 g
Sensor3-axis accelerometer, 3-axis gyroscope, optical heart rate monitor, altimeter, ambient light sensor, vibration motor, wi-Fi antenna (802.11 b/g/n), NFC (some versions)GPS, barometric altimeter, compass, accelerometer, thermometer, heart rate
DisplayHi-res touchscreen (up to 1000 nits). Corning Gorilla Glass 3 display. 300x300 pixel resolution.sunlight-visible, transflective memory-in-pixel (MIP), 240 x 240 pixels
Screen sizeScreen Size 24.1 mm x 24.1 mm1.2" (30.4mm) diameter
ColorsComes in a number of different versionsBlack, White
Other- Saves 7 days of detailed motion data – minute by minute.
- Saves daily totals for past 30 days
PLATFORM: Home Grown OS
PROCESSOR: Unknown
MEMORY: 7 timed activities, 14 days of activity tracking data
CONNECTIVITY: WiFi, Bluetooth
Activity tracking 
StepsYesYes
DistanceYesYes
CaloriesYesYes
ActivityYesYes
FloorsYesYes
SleepYes (light, deep & REM)Yes
Heart rateYes (Stores heart rate data at 1 second intervals during exercise tracking and at 5 second intervals all other times)Yes
Vo2MaxYesYes
Stress & recoveryYes
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
GPSYes
Running featuresPreloaded running profiles, GPS based distance/time/pace, run workouts, foot pod capable
Swimming featuresPreloaded swim profiles; Pool swim metrics (lengths, distance, pace, stroke count/rate, calories); Stroke type detection (freestyle, backstroke, breaststroke, butterfly); Pool swim workouts
Swim efficiency (SWOLF)
Other - SpO2 sensor that measures blood oxygen levels
- Guided breathing sessions
- Female health tracking
- gym workout tracking
- music control, find my phone, etc..
- Built in apps for running, golfing, cycling, swimming, snowboarding/skiing, paddle board, rowing, cardio, walking, strength training, rep counting, yoga, eliptical, stair-stepper and more.
Non-fitness functions 
Smartphone notificationsCall, text and calendar notificationsYes
On-board music storageYes, 2.5GB (300 songs) + access Pandora
Connected payYesYes
Links 
Affiliate link*Amazon | FitbitAmazon | Garmin
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