I have a couple of Dillon 550 toolheads set up to load 38 Special. The one set up for SWC bullets has Redding dies in it and is the one that gets used the most.
Like many, I have a collection of dies that includes several different manufacturers. The Redding profile crimp die is probably not much different than any other roll crimp, Redding just likes to use the label "profile crimp". However, the Redding dies are very good quality and are my top choice for dies.
Dies are one of those "buy it once" tools and when I can justify the cost, I'll select Redding.

The roll crimp created by a Redding "profile crimp" die is similar to just about any other roll crimp die. It turns the top of the case mouth into the crimp groove. The exact profile of that roll crimp may vary slightly from manufacturer to manufacturer but the process is similar.

In the FWIW category, Redding Dies are very high quality and are my top choice. RCBS is a close second.