ConsumersAdvocate.org has an article comparing and contrasting some of the available fitness trackers:
HOW WE FOUND THE BEST FITNESS TRACKERFEATURES
We checked for fitness trackers with diverse features that users could choose to best match their lifestyle and goals. This includes multiple health and activity monitoring options.
CONNECTIVITY
Many fitness trackers sync with smartphones or Bluetooth to receive calls, get message notifications, and send data to their corresponding fitness apps. We looked at trackers that were easy to connect.
COST
Regular fitness trackers can range from $50 to $200, while hybrid smartwatches can cost over $400. We compared prices to special features to make sure consumers get the most out of their investment.
CUSTOMER EXPERIENCE
Fitness trackers should be durable, lightweight, and comfortable. We interviewed customers and read dozens of reviews and testimonies for thorough feedback on each product.
Source: The Best Fitness Trackers For 2020
Click through for details. I use none of these trackers, so have no dog in the fight.
Steve Parker, M.D.
Advanced Mediterranean Diet 