I'm with w4w
122 for Stef.
133 for Muxx, even with the same 8.5 sail.
I haven't compared directly go122 vs f122, but I've tried earlier go~150 vs big Carve~145 (maybe that's not a relevant comparison, if that Go is really the same shape as Futura). What's your skill level, you don't have to be a pro to feel the difference. Go will be slower to plane, slower to accelerate, less willing to carve.