Well, nothing is going to be universally true, but here are my opinions.
Cable is generally much better for the equivilant price. In my city, cable is available for $41.95 per month, with 2 megabit downstream, and 384 kilobit upstream. For about the same price, 640 kilobit downstream with 256 kilobit upstream is available for DSL (this isn't necessarily the exact figures, but that's generally correct). Granted, with cable it's possible to experience speed degredation if several people in your same zone (I'm not sure how they define zones, but probably a group of 4-8 city blocks) are high-bandwidth users. This occurs because a specific amount of bandiwdth is available per each zone (with cable), and they don't increase the bandwidth available when there's more people using it. With DSL you have (relatively) dedicated bandwidth. You're still sharing the backbone bandwidth with other users in your city, but that's not going to fluctuate as much.
If you have enough money to buy like, 1.5 megabit synchonous DSL, go for it, but then again, 2 megabit downstream cable is going to cost a lot less.
I have heard of cable companies not supporting routers, and I've heard rumor of some prohibiting them, but I don't see how they're supposed to do this, when you can spoof the WAN MAC address on nearly all routers (just make that the same as your NIC MAC address, probably).
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