This would be a good fight without it being on Vjun.
If it was off-nexus...
Grievous at his peak would beat any member of the B-Team barring perhaps Mace.
Ventress would take out Fisto, take a very slim majority over Kolar, defeat Tiin and lose to Mace.
Dooku would be given a hard fight by any of the three that aren't Mace but beat them fairly swiftly because of TK/Lightning, and he would have a hard fought fight with Mace that he'd take a majority in through Force advantage.
Accounting for the numbers advantage I still favour team 1 - they are all capable of taking on two opponents at once, so really once one B-Team member falls it'll just be a domino effect from there. There's always the chance that Windu will take Grievous out the fight with the Force to balance the scales but that would probably only happen for a minority of the time.