There are several brands of dies, and within each brand there are some different features. Also, within each brand, there are some special purpose dies that some brands make and some do not.
Brands like Redding, RCBS, and Forster make basic steel dies, and carbide dies. Carbide dies are great for straight walled pistol cases because you don't have to use lube. You will always have to lube the outside of a rifle case, but I use a lyman carbide expander ball in my RCBS standard dies so that I don't have to lube the inside of the neck.
Dillon dies are nice because you can take them apart without taking them out of the toolhead. So their setting will not change. But, I do not like the fact that there is no way to adjust the seating depth on a standard dillion die without screwing the die in deeper. That is a very course adjustment for adjusting seating.....which leads me to the premium seating dies made by RCBS, Redding, and Forster. These are Micrometer seating dies that cost $80-$100 each for one die. They are very easy to setup, and the adjustments are very fine. You can literately adjust down to the ten thousandths. But again, they are expensive.
Then there are the budget lee dies. Lee makes two excellent special purpose dies including the factory crimp die, and the neck die. I do not use their bullet seating dies or full length sizing dies.
For me, I have won severl matches now with ammo loaded using standard RCBS dies. I also have some premium seating dies with micrometer adjustment from forster and love them.
So to answer your question: If you want to set up your dies to load the same bullet, for the same gun, with the same jump, and load a lot of them, then dillion dies are a great option because you can leave everything set and clean them....though setup for seating will take some trial and error.
However, if you want to do a bunch of different bullets, for different guns, and different loads, I would choose a different die than dillon.