I'll pick Bronco. I'm not completely happy where the program is, but I think Bronoc deserves 1-2 more years to right the ship after a lull.
Buck has sour grapes, which happens, but to say 90% of alumni feel like him and ask for a new coach isnt what he should be doing. Thats not true blue and not helpful, and Buck isnt that important.
Vai is an example of how a prominent alumni should go about things if they have an agenda. Dont go nuclear on Bronco and the program.