As an owner of both, I have a hard time suggesting one over the other from their production and usage. If you live 5v, and absolutely need a 5v device, then the GLV2 is the way to go. If you're cool w/ 3.7v, then the GLV Mini or the Sb will still be great choices.
For me, the biggest difference is the build quality. Everything on the SB is sealed up neatly and safely. I cannot say the same thing about the GLV2. That is the biggest difference between the two devices.
If you are hooked on 5v, try the SB with a Cisco LR atomizer. It's so close to 5v that my GLV2 has collected more dust than ever before.
I like my SB and my GLV2, but I will have a new 5v device by the end of the week, and I'll be moving my GLV2 onto a new home...if that is any indication.