I picked Redding for the simple fact they make dies for more cartridges than the rest listed. I also own RCBS.

"Best" for me is limited to RCBS because I can set and forget.
Inherited some Hornady dies that have slipped on me (decapping operation).
No dog in this hunt, though.

I own more RCBS by far. Availability, the quality is on par with the best of the others, value is very good and service is second to none. When I go to local outlets that is what I see the most of and I have zero issues with them, so I avail myself to that convience.