Withings wins that particular narrow field handily, their watches do about four things: notify, tell time, track steps, and heart rate.
But they have real hands, and the 'smart' part is subtle enough that most people just see a watch, a couple weeks battery is realistic as well.
Pebble hit a sweet spot in terms of how much you can do with it, while being good looking with a hardy battery. If we limit the comparison to the last two of those things, Withings is in the lead, not to mention still actively sold and supported.
But they have real hands, and the 'smart' part is subtle enough that most people just see a watch, a couple weeks battery is realistic as well.
Pebble hit a sweet spot in terms of how much you can do with it, while being good looking with a hardy battery. If we limit the comparison to the last two of those things, Withings is in the lead, not to mention still actively sold and supported.