They are what the companies make them
Here's why I think either one is what it is: I tried to get DSL twice. The first time was with some bullcrap company out of California who just happened to wanna work to get me access. That's about the only thing good about them. They cost more ($60) and it took like 3-4 months for them to get it in. They had to go through BellSouth (cause that's who owns the phone lines) and had Covad outta Atlanta to install it. Once it was up, it was BLAZING!!! I wouldn't have traded it for the world. But then it stopped. It wouldn't come on again for a week or so. Then it was on & poppin again for about a month or so and STOPPED AGAIN!!! It never came on again after that :redhot:
Later on, BellSouth called themselves offering access. Mind you, I'm only about 5 miles from a central building, so distance shouldn't be a problem. Still, when they tried to verify my lines, they said I was ineligible. Then they called again a month later and offered me DSL. So I tried again and they said I wasn't verified. At about that time, RR was newly available. I got it, it's been on for almost a year, and I've had NO DROPOFFS!!! Lemme repeat that... NONE!!! When I called initially to ask some questions, I have NO PROBLEM getting customer service (as opposed to waiting for HOURS with that group in CA, Covad, or BellSouth). That's what I mean by reliability.
As far as speed, yes I'm slower than DSL right now, but it's new & being built up. Plus, I have never experienced slower speeds because of high traffic (maybe cause it's new). I have friends on another cable system that started here earlier (Charter Communications) and they say they are just as fast as DSL. You really just have to know what's going on in your city to see what's the best high-speed Internet option for you.
I'd suggest going to
http://www.dslreports.com. They have loads of info on DSL, cable, etc options for high-speed access and reports from users about the companies in their area. There are also tests you can use to see how fast you're going. Good source.