What is the combined expected rent roll of the two houses versus the expected rent roll of the one house? 

The difference in monthly payments on a hypothetical 300k loan at low 2, versus high 5% interest rates is probably somewhere in the neighborhood of $700 per month so in theory I can offer a fairly competitive offer price and still do alright in the long term. 

Such as working with a residential owner versus a landlord or luxury home versus a residential property?

Sometimes it's ambiguous, but even then, why should I bother with the company that has numerous unresolved lawsuits, versus another company that is virtually the same but has none.

The first consideration should be cash flow: how much income it can generate versus acquisition, financing and maintenance costs.

How much could you make flipping it or wholesaling it versus what is the cash flow as a rental.

It did, however, show me the power of selling and trading up versus buy and hold.

Unfortunately in todays world most discussions are more like two three year olds fighting over a toy and people enjoy insulting each other versus having legitimate conversations

There is a big difference between managing an STR versus an LTR besides cash flow.

If any money goes to pay down a portion of the cost of property then your accountant may consider it’s payment as interest versus rental income5.