The Mossberg and Remington are the most ubiquitous of the group, and all are fine guns. The deciding factor should be whether the shooter requires left-hand or ambidextrous operation, as the Mossberg is better setup for that role. Otherwise, I would vote Remington (slightly more aftermarket and easier to run various stock configurations if the shooter wishes, e.g. pistol grip). The controls on the Remington seem much better for running something like a Knoxx.