I have used winter tyres since the mid 1980's. Until last year I only ever used them on the front wheels of FWD cars. Last winter I fitted one car with them only on the front and one with them on all four wheels. The car with them on all four had, at the beginning of last winter's snow, had them on just two. So I could compare the difference before and after the change.
Yes, it's clearly better to have them on all four. Driving on two does require a different technique. When you feel the back end slipping sideways part way around a corner you have to be confident enough to accelerate a little to pull the car straight. When braking, if you feel the back end starting to slip and the car begins to turn.you have to quickly release pressure off the brakes a bit - so you need to have left enough space in front of you to allow for that.
I find it quite easy to inter change between my own cars, with two or four winter tyres. The back-end slip on the former reminds me to adapt my technique. What is rather hazardous is when I get out of one of my cars, into a work car with summer tyres fitted. I hate doing that. I then have to be very careful indeed and driving becomes a very stressful and hazardous experience. This convinces me that four summer tyres in snow and ice can be nothing short of dangerous above 10mph or so. Such cars should be left on the drive in those conditions.
I'm certain that a reasonably careful driver with a fwd is far better having two winter tyres than not changing over at all, but running on four winter tyres is definitely better and they last longer on the back of a FWD than they do on the front. I do not have the experience to comment on RWD with two winter tyres. Last winter, with four winter tyres, I felt confident enough to drive purely for pleasure on the untreated hardly used lanes in the hilly north Pennines. With just two fitted during previous winters, I had to be a little more cautious, but I still drove on quiet and not quite so remote roads in snow for just fun!
So my motto is 'two winter tyres better, four winter tyres best'!
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