Both are unincorporated places without local control and STR rules set by the county.  

It will be a higher cost if you are looking for names, emails, etc. 

Join a local real estate investment association REIA, and go to their meetings.

Is there any benefit from local companies?

In my case, I fall into the latter - I only invest locally therefore the Nashville market is the best for two reasons.1 - I sell real estate in Nashville and I have an incentive for you to choose this market.2- I know absolutely nothing about the other markets mentioned in your post. 

Every system you try will have flaws, or you may salivate over a feature that appears in other software.Some familiar names are mentioned frequently: Stessa, Apartments.com, RentRedi, TenantCloud, Innago, RentManager, Avail, Rentec Direct, Doorloop, etc.I recommend conducting thorough research on each app online to understand their offerings, pricing, etc.

Local realtor.friend brought me the deal.

Oh, and my colleague's name is in the spot where it says "John Smith" in case you didn't figure that out.

Verify your local landlord-tenant laws for specific requirements, as some areas might have different rules regarding notice periods.

I would suggest talking to your local credit unions.