The most obvious point is that it's a multi-pronged approach. The way B corp works right now is that there's a certified B corp, which is basically a stamp you can put on your company when you have cleared all of the hurdles saying that your company is focused on people, on the planet, and on profits simultaneously. You make a small change in your articles of incorporation so that's reflected.
The B corp legislation takes that a step further, and many jurisdictions have built that into procurement and into other things in a way that allows government to be supportive of good business and of businesses that are specifically targeting specific issues. For example, in some states if you're looking at a construction contract for the state, then you would give preference to a B corp when the two bids are similar. That way you know, for example, in your construction project that not only will you be getting good quality and an affordable service, but you will also perhaps be helping people with previous job difficulties, or a portion of the profit will be reinvested into the community, or something like that.
It's a way for you to double tap, for you to get a bang out of your buck by also hitting one of the priorities of government by helping people within your constituency or within the country more broadly.