I assume you are talking about the new RCBS bench tool as compared to the Dillon, and not the RCBS press mount tool. The Dillon is definitely faster than the press mounted tool, and I would guess that it's probably the faster bench mount tool, but I've never had an opportunity to try the RCBS version.
The reason I think the Dillon may be made to go faster is there is a YouTube video that shows how to rig a wire and rubber band to make a linkage that automates flipping the anvil up and down to receive and release finished cases. That makes it faster than it comes out of the box. I don't know that you can do that with the RCBS.
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