I'm like you. I have a Fitbit One in my pocket and use a Garmin watch for running & cycling. I'm bullish on Fitbit, but what I really wish is that Garmin would high some competent engineers to improve Connect. The current Vivo series really has me second-guessing the Fitbit, since it really would be useful to has a synthetic activity view that combined my athletic workouts and my daily "background" activity.

Every company's trackers have some defect, though. Garmin's software totally sucks and it can't do HR tracking in the water. Suunto can do that but it's platform syncs with almost nothing. Polar, until recently, refused to use Ant+. Nike+ had a low barrier to entry, but then they figured out it would be impossible to compete with Suunto, Polar & Garmin so they pivoted to become just a platform. I read DC Rainmaker with avid interest, but as with things like cycling power meters there is way too much fragmentation in the activity monitor segment.