“Mercedes-Benz is constantly at the forefront of automotive safety technologies” - not really. Rear wheel drive, which is common in mb and bmw cars are a real danger in winter. Volvo claims, and seems to be, a safer and more at the forefront of safe driving choice.
It's up to the consumer: if you want a safe winter car, both BMW and MB will sell you an all-wheel-drive vehicle.
If you want to spend less, save weight, and have an enjoyable oversteer experience, they'll sell you a rear-wheel-drive vehicle.