Well I think the goal of each tuber manufacturer is to increase performance above the other guys. A lot of this comes to personal driving style. If I built a chassis, I'm going to build it to address the issues that I call problems with the other chassis's that are on the market, and to perform better. Since everyone has their own style, then some chassis setups will work better than others.
Tubers are generally designed to look like scale tube frame buggies, and take quite a beating. Because of their design, they are always going to be top heavy compared to a TVP comp chassis. There are usually some other compromises as well because the builder wants to fit the components into the theme of the chassis. The tubers always sit kinda tall compared to most of low profile comp chassis that are designed with a low COG in mind. Take the GC2 chassis for instance. It's one of the best performing chassis on the market. If you look at it (I have a build thread with one, with more to come soon), you will realize that it has quite a unique suspension, and a doesn't have much weight up top. It's made entirely of delrin, so it's almost weightless. Now if you build a tuber, there's just no way that you can use metal tubes and achieve the same level of performance. Now tubers have their advantages. They look good, usually look scale, and they can take one hell of a beating.
Timmah, I had the same questions that you had. So I contacted a friend of mine that I consider to be one of the top competitors and builders in the nation, and had a chat with him about it. He was building a really nice tuber, so I asked him if there was a way to get it to perform like a comp chassis. His reaction was simple: "There's not a way that anyone has figured out to build a tuber using metal tubes and have it perform like a tube chassis. This tuber is just a toy, if I was building another comp rig I definitely wouldn't use a tube chassis. They just can't compete with the comp style TVP chassis that are being used today."
