Re: Most successful claw design?
 

Rollers are great, given infinite weight, motors, and support. But that's rarely the case in robotic design.

The advantages of other claws aren't based on competitiveness, but on resources.

Re: Most successful claw design?
 

I think clamp claws work well. Our team is great with hitting a tube and grabbing it on the go. Our claw is a bottom plate with a pneumatic clamp at the top. Then we have something akin to a "tooth" to keep the tube in.

I also like how Team 1986, Team Titanium, has their manipulator.

Re: Most successful claw design?
 

I may be biased but narrow roller claws work like a charm. They very quickly acquire tubes, very quickly score tubes, and depending on their implementation can easily hold tubes from "impossible" positions, like the very corner of triangles or squares. ;)