K.C.
I love *LOVE* my Fitbit. Of course, I don't really know much about the other ones out there, so I can't say it's better or worse than any other tracker. But it does everything I want, it doesn't crash, syncing is easy, the website is easy to use, it's small and hides well in clothes, I really really love everything about it.
I have the kind of personality that works well with fitness trackers. If it says I have to walk 5 miles, I will. If I need to get 3000 more steps in for the day, I'm jogging in place at night to get to my goal. Between my Fitbit and MyFitnessPal (where I log my food), I've lost 20lbs (and counting). It motivates me to get off my @$$ and get moving.