I don't know the answer to this, but as a Fitbit user I'm interested in the question. I hope the OP doesn't mind me tagging on a couple of related questions.
1. Is the Google Fit app any better when it is fed by data from an Android Wear watch? When only fed by motion data from my smartphone (which is how I've tried it so far), it's pretty bare bones compared to the Fitbit app fed by a Fitbit band.
2. What notable activity tracking apps are compatible with Android Wear?