There are probably some confounds to why some brands may not do as well particularly brands that make mini vans and/or all wheel drive cars. AWD is just inhere

There are probably some confounds to why some brands may not do as well particularly brands that make mini vans and/or all wheel drive cars. AWD is just inherently more complicated and thus requires more maintenance. Thus Subaru probably has unfair advantage since almost all their cars are AWD. As for Prius reliability... I have passed many stuck sliding on the road in New England blizzards... in my "high maintenance" Subaru.