In reality, you should go shoulder both of them and see which you like better. Either will function well for what you ask.
I personally would pick the SBEII with a ComforTech stock. I love Benelli's, and, while they might have slightly more felt recoil than the Beretta due to the Beretta being gas operated and the Benelli being inertia operated, for the same reasons the Benelli is easier to clean.
There is not enough difference in reliability between the two to say one will better than the other in that aspect.
And yes, I have shot both. I have duck hunted with the A400 and taken the SBEII dove and goose hunting.
Currently, I shoot a Beretta 3901 for most of my hunting because for what it costs, I don't have to worry (as much) about dropping it in a lake