Honestly I think it's just personal preference

There are pro's and con's to each, so I think it's whichever you think is the better/worse of two evils.
Here are some Pros/Cons I found...
Glossy
Pros:
Photos will have a shiny finish.
Colors are vibrant.
Images are crisp and sharp (assuming the original photo was in focus).
Glossy finish does not produce a textured look when scanned and converted to digital.
Cons:
They are highly susceptible to fingerprints and smudges.
To remove fingerprints and smudges, you need to use a photo cloth and/or a liquid solution. Rubbing a photo, no matter how soft the cloth is, can produce scratches.
Glossy photos produce a glare, making them difficult to see from certain angles.
Matte
Pros:
Fingerprints and smudges are not as visible.
Since most professional prints are printed on matte-finish paper, photos printed on matte paper can have a more professional look. This is especially true with black and white photographs.
Glare is significantly reduced with matte-finish prints.
Cons:
The texture of matte finish can make a photo look grainy.
Colors are usually less vibrant on a matte finish.
The texture of a matte-finish print may produce a pattern or visible texture when the photo is scanned or converted to digital
(info taken from
Photo Finishes)
HTH!
Oh BTW ~ I tend to be a glossy girl
