just my thought:
the VF-25 might look better in matt finish, since it looks in a more "realistic", "Terran-ish" style in design language
but the VF-27, with it's radical design and that COFFIN canopy and flameboyant colors, just make you believe that is more of some alien stuff rather than human made
and gloss would fit better on VF-27 than matt to enhance the alien-ish feel.
I just hope they could modifiy the crotch, make it stiffer and get rid of the brace piece on previous version or I'll skip this one because I own the 30th renewal version with super parts.