I move alot all over the country and have used various providers for both Cable and DSL.

I have found that in general Cable gives you a higher speed, but can be more quirky and less reliable. With cable usually the bandwidth is shared for any area even though your suppose to have X amount of bandwidth for you.

The DSL bandwidth is generally less than Cable, but how it is setup you should have a fixed amount and it shouldn't go below that regardless of how many people are using it.
You have a fixed amount going from you to the provider, with the cable yours ties in with a number of other peoples on the way to the provider.

As far as reliablity it's probally more so the provider in your area than the type of service you have.

I have had cable internet that would never be down, and then in Southern florida it was really crap we were plagued with problems.
Now in Virginia it's not too bad but we will get intermittent problems

DSL I have never had problems other than them occasionally running some sort of maintenance that results in some downtime, which you will probally have occasionally no matter what you use.

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