Same here. I have used both devices and currently have the 9550. The typing in this blackberry is the best typing experience I have had in a phone. I've tried 81xx 8220 83xx 9000 8900 9500 and IMO this is the most versatile. Given that you have portrait qwerty (which I don't use), portrait SureType which is really good, portrait tap tap and landscape qwerty, all this with auto correction feature you will be making less mistakes than with other BB. Also the clicking on storm 2 is improve and it really feels like a phisical keyboard.
If you get the chance go to a Verizon store and try both, though you have to keep in mind that you will need many days to get used to it after all.
This post was written with my Storm 2