Recently we matted about 40 prints and framed 20. It was amazing to
see how much better a print looks if it is ready for final presentation.
What kind of mats you select is up to your taste but we would think
some white fits better to galleries. Some chose think museum quality
mats while other (like ourselves) stay with normal mats.
If you care about archival prints it should be clear that also all
your mats, glue and foam board have to be archival too (acid free).
Finally the matted photo get attached to a foam board (acid free again)
and framed or protected in a clear bag ready for display.