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http://www.superchevy.com/how-to/engines-drivetrain/0511sc-vortec/
Bowties are cheaper and flow better.
What makes you say that? I have no experience with any of them, but it's difficult to argue dyno numbers. With the bowtie being newer, I'd be inclined to thinking it burns faster. I know the original Vortecs burned faster than the TBI heads and the LS heads seem to burn faster yet. You must have dyno time or seat time with these, right? I saw you crew chief a roundy round car in another thread, so I'm guessing this is where your experience comes from.