I work in a photo lab and we obviously do both matt/gloss prints. Its interesting to find that ALL the protogs that come in all print on matt, with maybe the odd gloss but rarely. I think matt makes image look a little bit more dynamic/deeper if that makes any sense? That's usually for anything from 6x4 up to 12x18, then all our large formats are done on an Epson Stylus with Premium Lustre 260.

As for which is better, it really is personal preference, I like matt more