Cable is usually faster in rendered services, and is theoretically faster than DSL with a supposed 27Mbps roof, but it has never been successfully tested past around 11-12Mbps. DSL has been tested at a little over 13Mbps, but companies that sell DSL services rarely are not too cheap to buy the good equipment, so cable companies are almost always a faster option. When upstream is considered, DSL is faster in most situations.
On the security side, DSL whomps on Cable. Cable is distributed to entire neighborhoods, and so both your upstream and downstream content can be monitored by someone in your neighborhood with enough skills. DSL is capable of a lot of other options too, including the ability of using dynamic IP's, which means your IP rolls or changes every time you get on (preventing the vast majority of hackers from following you). Weigh all your options before deciding between cable and DSL.
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