DSLR vs. Tradition video camera
T2i vs. HMC-155
i like the HMC alot more at the end of the day. The colors come out more vibrant, and the overall feel is much better. Also much easier to film with, and more comfterble. Only bad thing i have to say about the HMC is the AVCHD workflow and Mac computers don't mix.
Also filming in general is much harder on a DSLR. They are very prone to shake, and there is no solid viewfinder to look through.