I also say the franchi I-12.

First off, it beats all those other autoloaders for waterfowl hunting because of the inertia system (stoeger and benelli apply as well) . Those other gas operated guns don't work well when wet or dirty, and the Inertia "driven" autoloaders are effected much less by these factors. Some say you can actually fire the inertia driven guns when soaked in water.