Up and Fuelband
Nike alone.
After several weeks of wearing both the Jawbone Up and the NIke Fuelband, I had to make a choice. I was going skiing and my warm weather gear wasn't fitting well over two bracelets. At the moment of truth, it wasn't even a difficult decision. The Fuelband won the battle for my wrist hands down. The Fuelband's combination of simple metrics, bluetooth syncing, dongle free charging, and immediate feedback trumped the Up's two best features, really beautiful industrial design and metrics about my sleep.
Ultimately, I've learned that knowing whether I've moved enough or not with the touch of a button actually does motivate me to move more. And while it's interesting to see stats about my sleep, it doesn't motivate me to sleep more. And if I did start to sleep more, I'm not sure I would feel more fit.
I also had real usability challenges with the Up, in particular regarding charging. There were several times when I noticed that I needed a charge, but didn't have the dongle with me. The direct to USB charging aspect of the Fuelband means that whenever I'm near a computer, which is often, I'm near a charger. And it seemed to charge faster.
I've got the Misfit Shine on order, and will try it when it comes out. In the meantime, I'm ready to hook my Fuelband up to Facebook and bring on the social aspects of the device.
Up plugged in with dongle (and cap on the side).
Fuelband plugged in directly to the computer.