They’re all Inertia. But not the same.
Spring in the Benelli is in the stock.
Spring in the Stoeger is over the magazine tube.
It does change how the recoil impulse feels.
Also highly recommend the M2
No experience with that optic... but I've been running a Strike Eagle 1-6 on my AR. It's a nice optic for the money.
And the Vortex warranty is superb.