Garmin vs. Wahoo vs. Hammerhead — which ecosystem should I buy into?

Across the reviewers we read, Garmin has the deepest feature set (structured training, ClimbPro, radar, Connect IQ apps) while Wahoo is repeatedly praised for a cleaner, more intuitive interface and reliable mapping. Hammerhead's Karoo is frequently cited for the best smartphone-like screen, but it wasn't in this candidate pool. Pick based on which ecosystem your sensors, training platform (TrainingPeaks, Strava, Zwift) and friends are already on.