I have used, and presently own, one each of Lyman and RCBS lube/sizers.
They seem to operate about the same, but I have always liked Lyman's ratchet on the lube screw MUCH better then the slidding handle on the RCBS.
It probably won't be long with the RCBS, until your handle is in the wrong place and gets bent. It can happen
Within the last few months, I had some sort of issue with the RCBS sizer, sent it in and they returned me a brand new one.
Well, it ain't new any more as I drilled down the top of the lube rod, inserted a short length of properly sized allen wrench and brazed it into place.
Now I can use the same wratchet wrench on both the Lyman and the RCBS.
Problem solved, and the only real issue I had with the RCBS sizer is now a non-issue.
Keep em coming!
CDOC