Assuming that the upper arms are horizontal at static ride height, it looks like there's a mild advantage for the dragstrip even if you aren't up around 100% antisquat. If anything, the shorter arms allow you to gain more antisquat faster as the rear begins to squat, which would call a halt to the squatting action a little sooner.
As you might expect, it's not such a good thing when seen from the 'cornering' side of the street. You end up with slightly more rear axle roll steer, and there's already too much of that as it is. I'm not at all saying it'll make the car undriveable, but it would become a little clumsier to maneuver through a slalom and a little sloppier about making sudden lane changes.
Most drivers probably wouldn't ever notice the differences; you've got to be pushing it pretty hard either way for much change to show up.
Norm