I have small wrists and bought a Small Band 2.
I had tried the Medium Band 2. It fit at the tightest setting, but I noticed that there were gaps at the "corners" of the Medium Band's "band" that weren't there with the Small Band. That is, while the Medium Band could feel "tight" enough when set to its smallest size, it didn't "hug" my wrist as nicely as a Small Band did.
So in the interest of a better *looking* fit, I bought the Small band.
The possible downside is that if I ever sell the Band 2, there could be more buyers for a medium Band than a small one, but that's just conjecture.
I had tried the Medium Band 2. It fit at the tightest setting, but I noticed that there were gaps at the "corners" of the Medium Band's "band" that weren't there with the Small Band. That is, while the Medium Band could feel "tight" enough when set to its smallest size, it didn't "hug" my wrist as nicely as a Small Band did.
So in the interest of a better *looking* fit, I bought the Small band.
The possible downside is that if I ever sell the Band 2, there could be more buyers for a medium Band than a small one, but that's just conjecture.