I just ran through test prints for several different papers using an Epson R2400 with standard Epson ink and the standard profiles from the paper manufacturer. (I recently upgraded from a 1280.)
The standouts for both color and B&W were:
1. Moab Kokopelli Semigloss
2. Epson Semigloss
3. Moab Kokopelli Gloss
The gloss papers really bring out deeper blacks than the matte. But, the better matte papers were:
1. Moab Entrada Fine Art Bright White
2. Moab Entrada Fine Art Natural (warmer than the Bright White)
3. Moab Kayenta
Depending on the viewing light for color prints... I preferred the matte papers for color when viewed under a balanced viewing light. When viewed under indirect natural light, I preferred the glossy. It's a toss up under tungsten. (for B&W, there wasn't a significant difference.)
I tested all of the usual Epson papers, an Ilford sampler pack, and a Moab sampler pack. After going through this, I encourage everyone to do their own testing like this. Preferences vary!
David