In our city Comcast delivers 3 megabits per second. Our other local cable company delivers up to 9 megabits per second. I have read about Verizon delivering 15 Mbps via fiber in Texas for what we pay for 3 Mbps. DSL is usually offered in a variety of speeds. You should compare your Comcast speed to the DSL connection. The larger number is always better.

   Comcast is often cheaper, faster, and more reliable. However, no matter who you go with it still depends on location.
A friend of ours a mile away started having enormous trouble with their connection which Comcast did not resolve for a very long time. They were going to switch to DSL. It's best to ask your neighbors about their service.

      Paul