I have dies made by Pacific (now Hornady), Hornady, Lee, RCBS, Redding, Wilson and Lyman. All of them work well and do what they are supposed to do. With very few exceptions, they are a lifetime investment. I don't have any Dillon dies so I can't speak to them, but there are plenty of Dillon users on the board here that can tell you all about them.
My favorite is Redding. I love their bushing dies and they seem to be better finished than the others. They are a little on the pricey side, though, but like it is said: "Buy once, cry once." I have had two Lee collet dies break. It wasn't worth the postage to send them back.
If I had to rank the ones I currently own, my top three would be Redding, RCBS and Wilson. I haven't had the need to use Redding's or Wilson's customer service, but I can tell you that RCBS's customer service is second to none. I have nothing but great things to say about their lifetime warranty. No BS. If you can still read RCBS on it, they'll fix it or replace it.
JMHO, YMMV.