I have always preferred matte croc to shiny ones. In fact, my shiny crocs are mostly smaller pieces - 25cm kelly and kelly pochettes. However, the mattes, I have in larger pieces - up to 30cm. Personally, 30cm is the max for me in croc pieces.
IMO, the mattes look more understated. Can be worn casually or to events. I have worn my 30cm matte crocs with denims, khakis and once with evening clothes (but that was for an H event).
I prefer them in the basic colors such as black, brown, reds (of course) and grays. The only other matte croc that I would get would be in blue jean (although not highly recommended by my SA as they have a tendency to fade). But I have seen this piece IRL and it is definitely beautiful! The only reason why I didn't get the bag was because of the diamond clasp. In hindsight, I should have just brought it home as I have not been able to see another one like it in years!!!
I hope you find the one for you, MrsS!