I have a Garmin 235 connected to my Note 5. Activity tracking and optical HR from a leader in the fitness tech space, plus I get notifications, weather, calendar, and whatever else I can find in the app store. Garmin Connect doesn't have near as many apps as android wear and the face isn't all that great compared to an AMOLED screen, but the battery lasts for over a week. Oh, and super accurate GPS when I want to go for a run.
I was waiting for the Moto 360 Sport, but after hearing the reviews, the Garmin was the much better choice for activity tracking and running.