Speed BS11>BS12 Stiff BS11>BS12 Head Heavy BS11=BS12 ( diff people diff opinion ) Power BS12>BS11 BS 11 singles BS 12 doubles
Having played with both extensively. I prefer BS11 than BS12. For me, BS11 can generate a more powerful smash. Stiffness BS11>BS12 Head Heavy BS11=BS12 Speed BS11=BS12 Power BS11>BS12
I can compare BS12 with BS LHI (= very simliar to BS11). I think they are quite similiar. Balance point same, but BS LHI stiffer.