RCBS Matchmaster vs Gold Medal Match?

[Wannashootit]

WTF is the difference between these two types (referring to full-length dies)
Both are bushings for neck, micrometer seating. Essentially the same price for 2-die sets.
Most chamberings are available in either "type".

What am I missing ?

 

[Dogtown]

I can’t really answer this, yet the Gold Medal Match dies have been around for a very long time. The Matchmaster series are new and likely an improved design, is my guess.