New to roms, getting diamond/pro?

[Bodo]

So in a couple weeks I am either going to get the diamond or touch pro from sprint. I eventually will put a new ROM on it. So a diamond ROM cannot be used on a touch pro, or touch pro ROM on a diamond, correct? Also, I am going to be doing alot of texting, email, browsing. Which would work better? Some say they can use the touch screen better than the keyboard. So I am not sure if the diamond or touch pro would be better. Are there any ROMS that improve the digital qwerty on the diamond? And finally, is there any major perfomance differences between the diamond and pro in terms of speed? I searched everywhere for comparisons between the diamond and pro but they were all comparisons from right when they came out or before the phones were released. Thanks for everyones help!