I currently own RCBS, Lee, Hornady, and Redding.
I mostly use Redding for high pressure bottleneck rifle cartridges, but my first ones were RCBS. All of my handgun cartridge dies are Lee, as are the .30-30 and .32 WS. I do have one Hornady 8x57 that was virtually gifted to me from a fellow who no longer had a need.
I find Lee and Redding the easiest to use; I do not enjoy having to use wrenches and screwdrivers to adjust the RCBS... my best use of them is for constant application and no further adjusting: secure the lock-rings and go from there.