I've got tools from Lee, RCBS, Hornady, Lyman and MEC. But mostly Lee.
I've got powder from Hodgdon, Alliant, Hercules, IMR, Winchester, and Accurate. But mostly Alliant and Hodgdon.
I've got primers from CCI, Winchester and Federal, but mostly CCI.
I've got bullets from Speer, Nosler, Hornady, Sierra, Berry's, Ranier, Magtech, Remington and Winchester, but mostly cast lead from a local caster.
My brass is likely more Winchester than all others, but I think most every company has some representation.
I love any tool, equipment or component that works, but I prefer those that work well for a decent price. When it comes to components, I will use ANYONE'S bullet, but I have my preferences for powder. With primers, I like to stick with CCI and only for the reason that it's what I started with and what I have the most of, and I don't particularly want to change primers in a load that I know works well.
Of all the companies involved in this hobby, there's only a couple that aren't represented in my man cave. Nothing from Herter's, because I've only been doing this 20 years and it's just not out there. There is nothing from Dillon, because Dillon stuff is mostly manufacturer direct, so I never pick up any of it at a gun store or a show. I also have nothing from Redding, but that's only because it's a premium brand at a premium price and I tend to avoid anything with a premium price. (I would venture a guess that it's VERY good stuff, I'm just too cheap to bother with it... my standards are lower, and I don't have a problem admitting that)
If there is one company out there that I would say that I don't particularly care for, that company would be RCBS. And that's because I began reloading in the 80s when RCBS was guilty of some real douchebaggery in their advertising and attitude toward Lee and Lee products. (to be fair, Lee was also pretty snotty) And since I started reloading with mostly Lee products, I saw most of that squabble through red colored glasses. As I learned more about the tools from both companies, it occurred to me that Lee stuff wasn't as good across the board as a lot of stuff from other companies, but it sure wasn't as bad as RCBS would have you think. And though RCBS makes some very fine equipment, I also find some of their tools to be more expensive and inferior at the same time. With that said, there's a lot of RCBS stuff that I do like and would be happy to own, but I really, honestly don't think that most of it is the best value for the money.
This is probably much more of an answer than you were asking for, but I find the subject pretty interesting.