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This question is a matter of opinion really. Just drive both, and get whichever one you feel you like more and can afford.
The normal stuff done to a 6.0 can hit 13s easily it appears, whereas a 7.3 you're going to need to spend a little more money - there is still a lot of factors though; tire sizes, weight, etc. etc.
With my guess you'll be a 1/2 second faster than me in a reg cab long bed 7.3 with the same mods. I know with more practice I can squeeze a little more out of it, not a whole lot more though.