I pretty much only hillrace. Glamis of course.
You need to look at a couple of factors, roll out for rear tires, and rider weight.
My bike has been extremely lightened, run a 7mil cub on meth, 38mikuni's, I weight 165, tires are 22x11x8 12pdl sls with a 10 over swingarm. My gearing is 15/44 and runs really really hard. NO DISSAPOINTMENTS! :biggrin:
Now that being said, if you are still dialing in your bike, not much weight reduction, rider weight is 220-250, and same size tires, then 15/46 might be better for you!
Nothing works better than trying it out, but make sure you have the engine dialed in before you go spend money on sprockets.