Should really get a pair, 2010 with all the snow disruption up here, but undecided if winter tyres are better.
Winter tyres are better for the simple reason that they're designed specifically for cold, wet and snowy weather.
They're not the solution for every condition though, on packed ice they'll still struggle.
Chains are ok if you absolutely have no other choice.
Problem is though they eat tyres for breakfast, a guy at work came in with a set of snow chains on the other year and he couldn't be bothered to remove them once he'd got to cleared roads.
The result was fairly new tyres that looked like they've been eaten by giant rats, totally useless and dangerous after as well.
You also need to severely restrict your top speed with snow chains.
Might sound like a daft statement when your pulling out your iced up street, but on a cleared A road in rush hour sticking to below 30mph is likely to be more of a hazard than a help.
Ideally you want winter tyres with snow chains in the boot "just in case"
Lastly,
How you drive and your tyre pressures play a MASSIVE part in how much use your car is.
Last year i got stuck behind a few soft roaders on the slight hill behind my house, not one could make up it the incline.
So i got out my rear wheel drive MX5, a car not exactly known for it's winter traction, let out a LOT of air out the tyres, took and run up, kept a even throttle using the motors torque rather than revs and drove straight past them
Best bet in terrible conditions though is to just stay in.
That way the roads are clear for those that NEED to go out and emergency services.