Yeah both grafittis sucked.
The first one was done by a better artist IMO, but Tanya's concept (bringing Harlem out of the 'mean streets') was just too stupid and had absolutely nothing to do with the game. It had two old lowriders on it, at least one of which was in 3 wheel hydraulic motion. ewww. No racing theme at all, and "tear it up" at the top.
The second one didn't look as good, but Had the PS2 logo on a finger ring, money falling from the sky, and the "rated E for Everyone" and "the drive of your life" on it, so the exec's liked it better. It also had some kooky car on it, looked kind of like a lancer in the front, except it had like a butterfly drag racing intake coming through the hood. Didn't make a lot of sense to me.
I don't think that being featured on the Apprentice delayed GT4, but I suppose anything is possible. I don't think the money they would have made from that feature would compare to the Christmas sales of the game had it been released in December.
EDIT: Of course if Sony was under contract not to release the game until around the time the spot was supposed to air, that would change things considerably... Now that I think about it, the Burger King campaign coincided with the air date of the Apprentice feature. Anyone have more info on the rest of the product releases of the Apprentice? Like the Crest toothpaste thing or the Pepsi Edge vs air dates?