I always bring in the rings from Sinclair to replace the RCBS "new" design ring. I buy them several at a time [12]
I only own a few Lee dies that get used, and one is the universal decapping die, which works fine, the others are collet neck sizers.
Four main die makers are represented in my collection of about 80 sets. In order of numbers: RCBS, Redding, Forster, CH4D.
I think I may have one each of Hornady and Lyman around, but am not using them.
I have 10 sets of competition dies with micrometer seaters, and they are all RCBS or Forster.
Also have 6 specialty dies from Wilson, designed to be used with an arbor press.
As has been noted, in our day of CNC machinery, and extremely fine tolerances, all makers are turning out good products.
It's largely a matter of personal preference. [and whose warranty works best, lol]
Lee has priced their products so as to introduce many neophytes to reloading, that otherwise would not have done so.
I see this as a very positive thing. Additionally, their unique collet neck sizers are a good addition to a reloader's bench.
When I started reloading, the options were much sparser, and some products were hard to find. [but they were a lot less expensive, lol]
Today, we are so fortunate to have such a wide variety to choose from.
Regards, Dave.