Listen to the Lady. Ask your neighbors about their broadband connections. It is IMPOSSIBLE to judge which is better based on general notions. I have had a cable connection that maxed at 4 Mbps (1 MB/sec download speed), and I've also had a cable connection that would get 10 Kbps during peak times (yes, that's right -- slower than a 14.4 K modem). My current cable connection sits around 200-300 Kbps during peak times, but the ping times are absolutely abysmal (300 ms to very good and close-proximity servers).
Also, what do you need it for? Generally speaking (see above for limitations to this statement!), DSL is better for online gaming while cable is better for downloading (MP3's, etc.). From my experience, once it is set-up properly, cable does not go out very much. I have heard people having significant problems with DSL going out though I have no experience with it.
I wish I could get DSL right now -- my server gateway is over 150 miles away, and we have a saturated node...