Dont know if the storm is faster then the curve, but i get about 3-4mbps on my curve on opera mini.. I'm with alltel and we got evdo and from what i understand its comparable to the 3G networks, then you have edge which is slower then those 2.. has far as I know.
the storm uses EVDO REV-A much faster than AT&T's 3G, and the curves now on GSM use EDGE i believe, and EVDO is faster than EDGE, EVDO REV 0 what your 8330 uses is faster than 3G unless the 3G is HSDPA which is sometimes around the same speed or a little faster