I personally don't like touch screen or at least they don't have one out that I like. I find it difficult to type on a touch screen. I think it is going to come down to personal preference. You might want to want till they hit the stands and use both of them and then decide.
I believe it all boils down to a matter of preference. I recently upgraded to my first blackberry the 8330 and I absolutely love it. I will never go back...Anyway I have owned a touch screen phone before. Personally for me the hard keys work much better then the touch screen. Plus I do all the media stuff on my curve( watch full length movies, music and net) so use both and decide after testing them out.
You definitly should wait till there released then go check them both out, play with all the features then make your decision like eveyone has said here.