Ah, gotcha. I guess it just depends on the riding you do and where you live then. Personally I think a new pair of S TRs will be as durable as the AS TRs, but maybe they wear faster and you get less mileage? I’m not completely convinced that where I live the winter roads are any nastier than the summer roads.
Having said that… I usually run the GP 4 Seasons in the winter purely for peace of mind. So I’m likely to switch to the AS TRs next winter if they are easily available and well reviewed. I hate being cold so dealing with a flat on a winter ride is a nightmare for me.