Mossberg or Remington

I'm in need of a new shotgun, I had a Mossberg 500 Mariner that I got rid of when I moved, and now I realized what a retarded idea that was, so now I need to replace it with a new shotgun. I definitely want to go pump with an 18" or 20" barrel. I can get the exact same Mossberg that I had for about $400, but I also saw a Remington M870 Marinecoat that looked nice too. Anyone have any experience with the latter?