DSL is the most readily available and usually the cheapest to install. It is very distance sensitive to the "switch" or DSLAM so most customers will get 256 - 512k service. This will provide an excellent level of service for all but the most intense users
Cable or Cable Modem provides service through the same line that delivers programming to your Television. The main concern is that it tends to be an "open" architecture which tends to be more susceptible to hackers. Cable also tends to cost a little bit more since there is usually a monopoly among providers.
Satellite is sometimes the only available option if you live in a remote area. There tends to be a higher equipment cost and the monthly access is somewhat higher than DSL. One drawback to Satellite is the distance the data needs to travel to reach the orbiting satellite. Even at the speed of light (186,000 miles per second) to cover the 35,000 miles means there is an inherent delay when you start each send operation. The performance is still much better than a 56k modems, but you will notice occasionally notice the lag.
The real difference might be that you can get one type of service and not another!
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