Correct me if I'm wrong, but I believe that the Subaru is full time AWD. Not sure that the Volvo's are. Maybe that is the difference?
Could very well be the tires. Differences in tire tread and ratings can make a big difference in snow/ice traction. Are the tires on the Volvo's VH or UH rated? What about the Kumho's on the Subaru? Years ago, I had a VW Jetta GLI 16V (high performance Jetta). The factory tires (Pirelli's VH's) were terrible when climbing hills in snow. After switching to less sporty HR's the car did better climbing hills. Snow tires are the best, but narrow TR or SR rated all-season tires are much better in snow than wider, sportier performance tires. Some of which are downright useless. Bet the Volvo's have wider, more performance oriented tires than the Subaru... :)
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