Seem like an odd thing to show them when you could also explain to them the difference in having two extractors with the Mossberg, the difference in the shell lifter operation and which safety works best for them... especially if they're a lefty.
The forearms of Mossbergs are wiggly. Remingtons are more prone to short stroking.
Spend the extra fifty dollars and buy remington. This is a test i always show customers looking at mossberg and remington, grab the forend and give it a wiggle, notice how much slack and play that the mossy has. In my opinion the remington is a much higher quality gun for a mere fifty dollars.