If the highest level of safety is important, then I would run the Yokos for summer, and invest in a set of dedicated winter tires, like the Blizzaks or the Hakapelliittas mounted on an extra set of wheels (saves the mounting problem twice/year and $$ in the long run). I know that you live in NJ, but on ice, those dedicated winter tires can stop in half the distance of all-season tires like the Yokos. Being able to stop in the shortest possible distance is important to safety.
Now, for less than the cost of 4 new wheels and tires, the Nokian WRG2s are a winter tire that can be run all year around. I have not seen an objective test of the WRG2s vs. say, the Hakapelliittas, but they would be very close...the WRG2s have great winter traction, the result of rubber compound, tread design and siping.
The cheapest option (and least safe) is to just buy all season tires. Most people do this...but that's because they think with their wallet at the tire store, instead of assessing risk vs. severity of outcome. I've seen so many wrecked 4WD and AWD SUVs and cars in the mountains of Colorado and Vermont that I've lost count. All that power management means nothing if the tires can't grip the road to brake or steer and the result is a crash...from simply sliding into a ditch to truly wrecking...and I have been behind several cars and watched them wreck while I brought my 2WD car with 4 winter tires safely to a stop to assist...
In your case, I would go with the WRG2s since you value safety over cost. They're more $ than the Yokohamas...but they will stop faster on ice, snow or slush than the Yokohamas...and get very close to the performance (and safety) of the dedicated winter tire set up.
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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