KR ,
IIRC the shiney is INOX which is Titanium. supposed to be totally corrosion resistant. I have no experience with Titanium in guns but I do in others items. Titanium is lighter than steel, and the devil to work on IME. Harder than woodpecker lips. Perhaps someone tha thas an INOX will weigh in here. MY thinking is what if I need the gun repaired, is this going to present a problem?
The reason I like the Matte is , the way the character wears in is subtle . I like wood and blue as everyone knows so the shiny of blue or black getting character does not bother me. I actually prefer blue guns because of the look naturally but also the metallurgy IMO is better than steel. Now my gunsmith buddy prefers stainless, he will admit right up front he likes the look of blue better. He will admit stainless "less" prone to rust, depends on the steel used. Since he works on guns , easier to bead blast and whatever a stainless gun to refinish. Me I never had a problem and sometimes wonder if the better metallurgy in blue, the better polish in blue or black required to get a really nice finish is even and advantage in resisting rust.
Easier to use a "finish" ( bead blast) to cover porosityor blemish, than to have to finish it out and have better QC if blued. That make sense?
I know from a former life a lot of stuff can be covered up by satin, bead, checkering...