rear wheel drive straightline car with no rear suspension...

Worse. First of all, it would be done more often if it were better. Weight transfer has something to do with it but also, every imperfecion in the track will cause the tires to skip on the ground resulting in a loss of traction. You want the tires/wheels to follow the ground as much as possible. Depends on what tire you go with really, I mean, look at top fuel guys.