Now we're almost exclusively Airbnb.

I have spoken with an agent who has worked exclusively in this space for years and have been told that for the Oklahoma market, warehouse tenants pay rent most generally by CHECK.   

But obviously, most folks need to choose (at least initially). 

If the tenant isn't available, they can choose to leave a key somewhere, leave the door unlocked, send a friend, or however they want to give access.

what should be a reason to choose 1 market over the other how to identify a market to buy?

You’ll want to talk to a CPA to help you estimate what your tax burden would be in both the under and over 2yr scenarios, see if you qualify for a partial exclusion, etc.It’s difficult to blindly say hold it or sell it now if you don’t have a full picture of what your tax burden.

Service the notice, explain what happens if they elect to pay, explain what happens if they choose not to pay ( wording is key, make them understand that although their finances are tight they're decided to not pay).

In the end, I likely lost a good chunk of time and money by choosing price over performance.

Pennsylvania's cities, such as Pittsburgh and Philadelphia, offer higher appreciation potential and lively rental markets, but the property prices are generally higher.Check out neighborhoods, compare prices, and choose based on your budget and goals.

Your description of the town house is non existent but in general I would choose a town house over a condo.