I got this from an Solar RV Tech at a local RV show a few weeks back.
He compared the new MultiPlus-II 2x120 and its Push-2-Connect Spring connectors to the Quattro-II 2x120 with Screw-Down Spring connectors.
On the MultiPlus-II, A/C Out #2 is embedded into the case so there is no room to have a screw type connector on it.
The Quattro has its A/C Inputs and A/C Outputs outbound on the board so they all have room for the normal Screw type.
This is what sold me on the Quattro.
I don’t need the Quattro’s secondary A/C Input on the RV, but when I sell it I can always use it on the house and connect it to the Grid and my Generac.