well i have both and they both suck, since my cable is non docsis so anyone can suck up all the bandwidth they want too and eave you with none, the ADSL is pacbell and its horribly bad.
its really dependant on the area, on paper ADSL should be better, since its not shared, cable can be faster sometimes.
best thing to do is go to dslreports.com etc and look at peoples connection speeds in your area, as well as which carrier since that affects it too.
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