The difference tires can make is truly amazing. A 4x4/awd on mediocre summer or all season's will likely be outdone by a front wheel drive shod with proper winter tires in good condition (tread depth). I myself have personally experienced the radical diff tires can make, with my Forester. Sure, it's got the vaunted awd and all, but the factory tires were Bridgestone Dueler all seasons which were so-so when new but once they passed 20K miles they because downright dangerous in the snow and especially treacherous on packed ice/snow combo. I litlerally had to slowly skid through a fairly glazed intersection a couple yrs ago honking my horn and pulsing my hgh beams to alert everyone "look out, [censored] w/ poor tires sliding through!!" Humiliating, and dangerous. That was the last time for that. The Bridgestones still showed acceptable tread wear but the compound was [censored] for snow and ice. Later that year, I upgraded tires. Since then, upgraded again to Nokian WRG2's, about the only "4 season" tire with the severe snow service mountain snowflake emblem embossed on the sidewall. And man do they rock in this recent weather. Granted they have pretty much new tread depth, but it's like it's shod with claws now instead of just paw pads.
On a side note, the worst 4x4's for poor driving I've seen are some kids with the 20"+ bling bling rims and shallow sidewall wide carcass summer tires on their SUV's. Delusion of capability but the absolute worst type of tire to have mounted for winter. Might as well have slicks on.