My personal preference as far as finish durability goes is the 442. I have had no issues with it in years of discreet carry. The 642 has a clear coat finish over the aluminum frame that wears and flakes, giving the frame a mottled look after a short while.
Having said that, I use both. The dark 442 for daytime wear, and the light-color 642 for evening wear. The object is that I want any potential bad guy to see immediately that he is facing a gun - the quicker to change his mind on any nefarious scheme.
Here is my duo -
John
