The others are cheaply made to a price point and are not worth making out the paper work to buy them.
But how do you really feel?
http://world.guns.ru/shotgun/sh08-e.htm
This is clearly the best pump shotgun in the world. It is the best because you can't get it, and if you could it would cost 10 times what any other pump gun does.
Over 10 million Remington 870s have been sold. All of those buyers are obviously idiots.
Therefore guns that can't be obtained are the best.
Just a little jab at the "logic" displayed in these type threads.