The GTS is the quicker car on paper(high 14's-low 15's), but it is much more difficult to drive fast. Due to the GTS driver's inexperiance, I'd give the nod to the GP. I'm also a little biased since the GP is the same as my car minus the supercharger.
95mustanggt, it's pretty hard to miss a shift in a GP...they're all automatics. In my GS, I just put it in second, and can run the whole 1/4 before shifting to third.
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Take Care,
Dave
95 Mustang GT Convertible - SOLD
2000 Buick Regal GS (240hp)
1967 Electra 225 convertible (360hp)