I talked to a customer service rep about this.
The gs mini is a travel guitar. They didn't even plan on ever putting electronics in it.
But customers wanted it so they did.
Idk why they would downgrade it from the Es-2 but they did. The benefits of the es-b is the tuner and the dramatically extended battery life (I think 300 hours). The sensors are placed the same way as the es-2 (three screws in the bridge) but the pre amp is much smaller and thus, less powerful. I'm unsure exactly how much this affects live sound but the rep told me if I was serious about using it live, to get an es-2.
I played a new gs-mini with the es-b and didn't hate it. I'd have to try it out to see how it sounded through my pa.
I have a gs mini-e hog on back order with the es-2 system, but I don't even know if I'm still getting it. It was supposed to be delivered two weeks ago...
I may just end up trying to find a used one with the es-2 online or get a purely acoustic one and install a pickup, Idk yet. Too many options. I just want the es-2 one
Oh well, life goes on