Welcome to the T&TH forum. Glad to have you here.
It's just hard to beat the Remington 870! It's a time proven gun and has been pointed out, there are so many ways to "customize" it to meet your needs.
I'm also a Benelli Nova fan. I've owned one since they came out and found it to be a very reliable shotgun that needs little in the way of maintenance. The bore is chrome-lined and most of the exterior is plastic coated, so rust is not a problem.
I'd go with whichever gun feels the best to you. You won't go wrong with either.
"If he's out of range, it just means that he has another day and so do you."