I think to answer the question, we need to clarify between rifles and handguns. Really, I don't know of any die maker that doesn't turn out a great product. We could full stop here. But ......
For handguns, I got rid of my RCBS dies and went Hornady (I know, I know - blaspheme), but I just like how the seater dies work. In fact, I sold all my RCBS on here - snapped right up.
In rifles, I think you have got to define what results you want, and you have to have an honest assessment of the accuracy level of your rifles. What's the saying "put lipstick on a pig"? Most rifles will do well with standard dies.
I happen to have both Hornady New Dimension and Redding Series A for general work in hunting rifles. Really not much difference between the two in my opinion. They both turn out very good ammo, especially w/ careful brass prep.
For my varmint rifles, I finally tried Redding Type S bushing dies. After some time working w/ them, I'm happy I came this way. A tad expensive in relation to standard dies. I admit that I haven't been tempted to try them for my hunters.