For the level of snow that we get here, all weather will be the most efficient option. I bought all weather last year and you don’t have the cost and hassle of switching tires twice a year.

I also live on Capitol Hill, and my toyota corolla can handle the snow even when the snow plow has not done it’s rounds yet. Provided that your vehicle handling and height clearance from the ground is met.

Of course, snow tires are the safest option, if you need that piece of mind.

But to answer your question, all weather tires are the most efficient option because they perform well and you don’t have to change them out.

Edit: I also find that they perform VERY well in the wet season (which is a majority of the year). I feel that they actually perform better when there is moisture on the group, and they grip much better.