The best?
No question, the Redding dual ring carbide dies. The ONLY carbide dies in the world that retain the slight taper inherent in all "straight walled" cartridges.
Be aware the you need 2 different copies of these for 44 special and 44 magnum.
I have these and will never need or use any others for .44 handgun cartridges.
They will last at least a lifetime given the proper care.
I also use the "M" die for mouth expansion as my Reddings are several years old.
Got them when they first came out and the 44 special version was kinda rare.
Redding also makes the famous "profile" crimp die which is reputed to have the best hold on bullets especially for full magnum loads.
If you are going whole hog, also get their taper crimp die and you will be set for just about any 44 project that could come up.
And now a comment or .02 about carbide dies in general.
When sizing, especially nickel plated cases, some galling can occur which may build up a bit of metal on the dies.
This will be noticed when the cases start to get scratched.
Chuck a .45 jag in a bat-drill and using some JB compound or similar "polish" the dies until they are clean.
I do this every few months on an irregular basis just as a maintenance routine.
This can be almost completely avoided by LIGHTLY lubing the cases.
They say you don't need lube with carbide dies, but it goes WAY better with a small amount.
Even just rubbing them with your fingers is sometimes enough it takes that little.