No, summers. It is easier for me to observe and analyze traction on summers. Infrequently, but I do push my 3P to the edge of traction, more when it is wet. In winter it is harder for me to analyze what's happening to the car beyond "must be a rear bias" sort of things. Sometimes, the car behaves really well on the snow, sometimes OK, sometimes I am driving a snowy highway uphill and course stability is compromised unless I depress accelerator and go slower than other cars around me that don't show any signs of struggle.
While discussing AWD, it does not really matter it is summer or winter. AWD should react to loss of traction well. I _can_ imagine AWD being optimized to dry/wet/gravel/snow but it does not sound like the technology is anywhere close.
AWD systems in ICEs are increasingly electronically controlled. Since 2007 we had an Acura with SH-AWD that had some magnetic clutches to control torque to rear wheels. I noticed Audi has introduced a new AWD with electronic control and uses it's sophisticated but mechanical torque sensing differential on fewer models. Simplistically, AWD on Acura felt the safest and the most predictable and the Audi S4's we still have has AWD that is way sportier and more playful.
That's what I use in winter for the last 9 years or so and before that I drove on all-seasons to ski resorts and got where I wanted to get with same rate of success. Observing variety of tires when riding with other people and driving other people's cars, I can tell that, in ability to maintain speed on a highway in snow blizzard conditions, performance winter tires are closer to all season ones than to proper winter tires. Having bigger tire and a heavier car helps a lot too.