An SUV tends to be safer than smaller vehicles. There are reports showing that drivers or passengers are 50% more likely to survive a crash. This is a quite convincing reason why you should buy an SUV.
However, even the newest SUV may not prevent you from getting in an accident, especially if you don’t have appropriate tyres in good condition under it. That’s why you should have proper winter tyres during winter conditions: they will decrease the likelihood of an accident. So be wise and put proper SUV winter tyres on your SUV and be even safer.