I really wasn't talking about consistancy, in my download speed. It's very, very consistant. A site I do a lot of downloading from, easynews.com, always, un-failably supplies me with 600k+. I have time warner and that means Road Runner. They rate the connection at 5mbps. The problem I've had with Cable is it's reliability. I have had so many periods of complete downtime, it kinda pisses me off. I've been through about 5 routers from the cable company in about 3 years I've had it. They know they are a problem too, cause they will swap them out no questions asked at Time Warners retail locations.
When I had DSL here, Cincinnati Bell, I had a Cisco Router supplied by them. I hardly ever had any type of outage, any type at all. But once cable became like 4 times as fast as DSL here, I had to switch. Cincy Bell upped it a little and now DSL here is good for about 3mbps so it's only half as slow, but the speed is more important to me and really, cable has gotten better.
I don't know much of anything about what people are talking about when they say you are "sharing" your bandwidth on cable. I've always gotten my 600k, regardless of time of day. I think that may have been the case back when cable was still in it's infancy, but I don't think it is any longer. Some of that was marketing hype of the part of the DSL providers. Everyone I know that has cable always get their rated speed, never a problem.
To sykotic, Verizon calls their fiber service, FIoS. It's max rated speed is 30mbps and planty of people say that is perfectly accurate. The only downside is that you are extremely lucky if you have a verizon fiber drop at your house. Not too many areas do.
Oh well, I'd try both if it were me. Here, you can easily talk the cable company into giving you a free month to try it out, just tell them you currently have DSL. In fact, I'm pretty sure I went to the phone company and told them that I had cable and wanted to try out DSL, and they gave me a free month too.