Fitbit Blaze vs Surge. Two of the most popular fitness trackers are the Fitbit Surge and the Fitbit Blaze. In the battle of Fitbit Blaze vs Surge, which should you choose? Which one is better for you as a cyclist and an athlete? This post compares the Fitbit Blaze and Fitbit Surge in depth to help you decide. Includes a comprehensive table comparing all features.