Actually you should find them pretty similar, and likely you'll prefer one over the other. At my real job we use asp, but I personally think php is much more flexible, and that's what this forum is made up of.
Both have their ups and downs. Eric (epeter) is our php guru, so he likely will know the biggest differances. I'll let him respond on that
"Greatness is not a function of circumstance. Greatness, it turns out, is largely a matter of conscious choice, and discipline." - Jim Collins