I'll go to whichever game suits me better.
I like a nice flow and responsiveness to combat. Not forgetting the freedom to choose how I fight.
If it's M:BG, then it's M:BG, vice versa for MB II.
If M:BG sucks (Which I REALLY REALLY doubt), I'd probably try to make a CRPG style mod for MB II.
I need to satisfy my CRPG addiction damnit!