Section 8 would tend to carry higher repair and as a result, additional vacancy.OP’s definition of cash flow is rent minus piti.  

Texas tends to favor landlords in these cases, but follow the legal process exactly—any misstep could delay things.As for protecting against retaliation or property damage, installing security cameras (if you haven’t already) to monitor common areas might be worth it.

They tend to have more stable tenants, no shared yard maintenance, and better long-term appreciation potential.

I have found that multifamily properties tend to cash flow better than the single family homes. 

To your point, passive real estate investment returns tend to form a bell curve, with a few underperforming, a few overperforming, and most falling in the middle of the bell curve.

Of course your other debts including student loans go into the mix to come up with your total debt to income but the income needed  is a lot smaller then a lot of borrowers in your situation tend to  think.  

Industrial properties tend to have more stable demand due to the increasing reliance on e-commerce, logistics, and warehousing.

I find that internet providers, like Comcast, tend to update their technology and offerings to better speeds as customers have higher usage demands.

Airbnb price suggestions tend to run on the low side.

I allow pets and charge a pet rent of $35 a month, its nice bit of extra money and pet owners tend to stay longer as tenants.