Switched from a Fitbit Ionic to a Fenix 6 Sapphire so I will compare the two in this review. Comfort: The Fitbit ionic is smaller on wrist and therefore more comfortable Accuracy: The Fenix 6 is a more accurate step counter, the Ionic is a more accurate sleep tracker (do not get a Garmin watch if sleep tracking is a priority, its not very good).

https://www.amazon.com/Garmin-Sapphire-Multisport-features-Grade-Adjusted/dp/B07WL4ZHQ5