Well, presuming you know that main difference is gloss have a more shiny effect and matt a more dull finish

, I find each type has some advantages. Ultimately the choice will come down to personal preference.
I mostly use matt as they are easier to handle without smudging, finger prints, etc. which is essential when my little girl gets hold of them!

Also, matt doesn't seem to catch as many reflections if you are going to stick them up somewhere.
I have liked the more shiny effect of the gloss on a few pictures I've had printed though (when I did likes zail suggests with comparisons). For some reason they seem to be easier to see finer detail on. I sometimes feel like its harder to pick it up on the matt versions.
As mentioned, try both and see what you like
