In it's day, the V-65 Magna was the fastest straight line production bike in the market...
I would expect it to be CLOSE... I've ridden both and off the line, the V-65 Magna would probably take the lead, but when the VMax got into it's power range (VBoost) it would make a race of the confrontation.
I was surprised to read how the B-12 Bandits routinely had lower ET's and higher 1/4 mi final speeds... not a lot, but enough to beat VMax every time. BHP and Torque on the VMax are greater, but so is weight and Max is shaft while Bandit is chain drive.... Rider reaction times could be deciding factor too since the time/speeds I read were so close.
This said, I have to add, VMax is one real GO DOWN THE ROAD machine for sure. I was riding, some years ago, in the back seat of my son's car on a narrow two lane tarmac road on the Spanish island of Mallorca, we were running about 125klicks... I heard the singing of a bike engine... suddenly, a VMax literally flew past us as though we were a speed limit sign. I have no idea of the guy's speed, but I'd estimate it at 200 klicks or greater... He was really "GOING DOWN THE ROAD." I WAS IMPRESSED..... He was crazy.
JR