My understanding was that Winchester's WS-2 choke was more open than the WS-1. The two WS-1s I have (12 ga. M12s) mike at 7 and 9 points, tighter than optimum in my opinion for skeet. I can't imagine WS-2 being tighter.

A serious SxS for skeet? Probably a M21 because they are easy to come by in a pistol grip/beavertail configuration.