ALl I know is I got Verizon DSL and it is pretty sad. I only got it because it was $30 for the first 3 months, and im going to be home and not at school for the summer (which is the 3 months I am paying for). Also they had a free modem and startup kit for the promotion. So I'm paying $90 for the summer for DSL. But honestly I think it is pretty sorry. I get decent DL speeds (60-90k), but i get cut off ALOT and it doesn't allow me to connect right back. Usually have to wait a little bit. And then sometimes, I will have spurts of a day to 5 days where I get speeds SLOWER than 56k!. Not to mention, the up speed is capped at 15k/sec.
I would definitely stick with cable if you have it in your area and can afford it. I don't know if all DSL is like this, or if all Verizon is like this, or if it's only like this in my area. But I have been fairly dissapointed with it during a lot of the time I have had it over the past 3 months.