The B23 is probably 10-12 mph quicker than a Phantom 21 with the equivelent power, and I think it's fair to say, that in all but the roughest conditions (and as Scotty says, with the right driver) the Bat Boat is streets ahead of the Phantom.
Of course it's not terribly practical as a pleasure boat, what with the tandem cockpit, and huge pretruding wings, but as a raceboat, they're awsome.
With the hp you've got in your V6, a Phantom 23 would be a nice boat for you.
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