DSL is a dedicated service, meaning that your bandwidth is not shared by others.
While this is true, the distinction is almost meaningless as a practical matter. Yes, with DSL you don't share bandwidth with your neighbors...until your connection gets to the CO, where you and your neighbors are all dumped onto the same trunk line, and you share bandwidth there. With cable, you share bandwidth in the neighborhood first, but eventually you're competing for bandwidth on DSL also.
DSL is often available as a Symmetric service - same speed up - same speed down. Cable is asymmetric - normally about 128 up and 2 meg down.
Again, this is mostly true. There are symmetric cable systems available, but it's not as common. And while SDSL is widely available, it's almost always more expensive (sometimes significantly so) than ADSL.
Lastly, customer service. This is the normal price, support, etc etc
Here, DSL providers and cable providers are roughly equal - they all really, really suck.
In short, I agree - they're roughly the same ;)
Comcast cable in my area is great with customer service. I had a major problem once and they calmly walked me through it all and in a way I could understand.
But I'm still trying to figure out how to use my free web page service, but I'm a geek with that stuff anyway.