Ha! That's like asking Canon or Nikon, or iPhone or Android
Personally, I like glossy prints. Although, I'll admit that I've never had a layout printed on matte paper at Persnickety. This is what they say on their blog:
Glossy vs Matte/Lustre Prints
The difference in print finish is difficult to show online. Paper is something that needs to be touched. This isn't normal paper. It is photographic paper. Light is a huge factor, and we still use a darkroom to change our paper rolls. You will never get this kind of a print quality anywhere else.
The paper finish is a personal preference.
Matte is a more popular choice for digital scrapbook layouts. Glossy has more of a vibrant "pop", but there is some glare. Glossy also retains fingerprints. We use white gloves when handling our glossy prints. I would recommend going with matte prints for anything that is going to be handled. (photo cards)
Both paper types are waterproof, and so archival that you won't even be alive to see them fade!
ETA: here's the
link to the blog post - there is a photograph of the two print types side-by-side