Answers:
DSL (Digital Subscriber Line) is the conenction that go through your phone dash. It depends on the distance between your house and the station. The longer distance is, the slower the conenction speed is. That's why within some place, you can't win the DSL nouns. But it is the other on conenction. It have smaller amount lost connections compares to Cable Connection. DSL provides the speed of 768K to 5Mbps.
Cox is the Cable Connection. Cable Conenction is the fastest connection for home use. User can find Cable Connection any where on earth, as long as they hold TV Cable. Cable Connection is usually the TV service provider. It does not depend on distance resembling DSL. But it depends on the number of users on the street. The more users using it, the slower the conenction speed is. Cable costs more than DSL. Although it is not the other on nouns, but it give us the unbeliveable speed! It provides the speed of 4Mbps to 20Mbps and more.
Based on my know-how, Cox is better.
Good Luck,