I was looking for a good tool to predict my time on Mt. Whitney. I had some good suggestions (over on the Whitney Portal board), but I found the best predictor was Skyline: My Whitney time (going up only, of course) was only about two minutes different from my Skyline trail time.
I believe some of the people on this board have done both as dayhikes. All other things being equal, do you find your times very close also?
z