Why bother choosing? Any solidly built enclosure should have glued joints, as well as screws, biscuits, dowels, whatever tickles your fancy. Yes, you can use only glue if you want to, you can do anything if you want to.
Most of the people on here stating that plywood is just fine, etc, are right. Yes, plywood can make a workable enclosure. However, for those that say plywood is just fine, I'd be willing to bet that some/most of them have not seen a quality built MDF enclosure. It's like a brick house. You drop your box on the corner and it just dents. It doesn't chip, break, peel or get funky. Just a solid thump, and a dented corner - the box is still fine. MDF is solid and works well for a reason.
Try what you want, but if you shop around you can find inexpensive MDF. It's kind of a b*tch to work with, but once you get past that issue, you're home free. Just learn to make very accurate cuts, and plan it out so it fits like a glove. There should be no cracks, mismatched angles or anything. Your box should be practically air tight WITHOUT sealant/silicone/glue. That way the little bit of sealant you do use, creates a really good seal, and a really good enclosure.
That's my two cents, have fun with whatever you use.
T.J.