Might as well list my favorites;
Pistol sizing/decaping; tie between Dillon's spring loaded decapping pin sizing dies and Redding's dual ring sizing dies. I Wish someone did both in one die.
Rifle sizing die; Dillon's carbide sizing dies. Why don't they make them with spring loaded decapping pins like the pistol ones???? Aside from that, I prefer RCBS and their carbide expanding balls and also their "x" dies which I like a lot, again why doesn't some maker combine all these features together???
Pistol expander; the "M" style dies. Redding makes the same thing as lyman now but does it better IMO. I purchased some "m" style expander inserts for the lee dies from a company called NOE (night owl express) and modified them on a lathe to be used in Dillon powder dies, required turning the outer diameter down .008" and drilling out the center and flaring the new hole to a funnel shape to run powder through. A company (Double Alpha I think?) Makes this very thing for 9mm, 40, and 45 ACP but if you run larger cast bullets or 45 colt, you're out of luck as far as I know if you want to expand at the same station as the powder drop unless you do what I did. I noticed my pistol ammo is more consistently accurate when using the the "M" style expanders. Less potential for run out I think.
Pistol seating; redding competition seater. These are my favorite by far. If another company makes something similar with a sliding sleeve and a micrometer on top I definitely be willing to try it. I believe these dies also produce more accurate ammo. For cartridges I can't get in the Redding competition, I just use Hornady's.
Rifle seating; Forster micrometer seating die, or Redding's. I pick Forster because I have read they are less prone to failure/breakage, and they are cheaper.
pistol Crimp: Lee factory crimp die for semi autos, and I don't have a preference for revolvers as long as it does a decent roll crimp. They all seem to do fine.