Not a fair test at all!
Obvious hell bent on get getting the point across, but I reckon the smaller car would have made reasonable progress even with standard tyres. A light car with thin tyres, a manual gearbox and no doubt a puny engine. As opposed to the large car with great big fat (wide) low profile 19's, straight into first gear (you are best starting in 2nd in snow) and huge wheel-spinning torque.