I have @Home cable service too, and my own experience has been that the Cable offers more bandwidth than DSL, but it does bog down as more people get the @Home service too(the nature of Cable).
I've also noticed that many DSL users seem to get much better ping times on the UT and CS servers on the Net; granted, their overall bandwidth might not be as great, but I'll take a faster ping over greater capacity[when playing a game head to head on the Internet] anytime!
Unfortunately, DSL isn't being offered in the Grand Rapids area. It is available in Lansing and Muskegon(MI) though.. go figure..