While I will carefully review and compare both policies to make a good decision, I want to know if anyone has used them and recommends them. 

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

This can reduce occupancy and reduce the average nightly rate (as compared to a higher nightly rate and lower cleaning fee). 

If they have stood the test of time for 100 years, likelihood they will stand the test of the time for the next 100 years.Deduct extra as a margin of safety for CAPEX from the bottom line but also keep in mind that repairs are much lower in Ohio compared to other states.

Concord doesn’t have good school districts as compared to Walnut Creek though.

Now comparing the biz to a CD....

The cost of living is extremely low compared to other cities and you can still many many positive cash flowing and 1% deals here.

It is not regulated compared to your traditional conventional /FHA loans.

How do these compare?

Getting started I wouldn't avoid single family homes, there are more of them, they cost less comparatively, and as Greg stated they are just less complex.