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I would spend more time on custom descriptions for the ones that you have reviews on. The goal would be to have as many citations with gold stars as possible rank high for your brand name on Google. That way when customers search for you, they are blasted with nothing but gold stars. This brand name is a good example: ME Contracting

It doesnt really matter....for now. Obviously, you'll need to pay more and give more information to get the better certificates so THAT might have an effect in the future. Who knows when. I'm currently moving some of our sites to different certs to test them in the coming year. Getting the greenbar, say like Yoast's site or Paypal and many others, it does give you a more secure feel. For regular browsers, it could mean that it's safer, maybe it could lead to better engagement/conversions

Are there any storefronts or places where the business does in-person transactions?

Hi Surfsup, I agree you should concentrate on one domain and agree that it should be the older one. Before deciding on whether to redirect or not, I recommend you profile the links to the site. There might be some good ones that would, as you say, give your elder site a needed boost. If that's the case, you should consider redirects or asking the source to point to your older site directly so the entire link value transfers and can be sustained over time. If you have bad incoming links, then you'll have to weigh the decision to disavow them before redirecting or not bothering to redirect at all.