Hi...
I have had excellent results with RCBS dies over the years.
I started out with Lee dies because of the price point but soon discovered that they were not quite what I was expecting.
Replaced them with RCBS... excellent quality ammunition resulted.
I have a couple of sets of Hornady dies to use with my two Hornady LnLs but neither I nor my son are particularly impressed with them, so they are being replaced with RCBS die sets.
I have a few sets of Redding dies...few rounds loaded, they seem to be superior dies.
I have one set of Dillon dies for the Dillon 550s but haven't even set them up yet.
Also have a couple sets of Lyman dies that I bought at auction...look OK, but haven't used them.