Quote from cgeorgan:
You are being under served by the community here.
DSL vs. Cable Modem: One is not necessarily faster than the other.
DSL can be quite fast, on the condition that you live close to the relay station the phone company uses. If you're far away, your speeds will suffer exponentially. If you're lucky enough to be close to a relay, you'll have speeds that are faster than cable.
Cable tends to be stable and overall fast when you compare it to the average of DSL speeds.
You'll only know for sure if you have both and benchmark the speeds from your house.