Right now the regular properties are appreciating much faster. 

The cash flow from the 30 year would be better but obviously the 15 years it would get paid off faster.

Each property purchased on the line pays off faster than the last with the added cashflow.

If it wasn't for debt most of us wouldn't have been able to invest in real estate and debt has helped many of us grow much faster than had we been forced to cash buy. 

I understand the 15 year would pay its self off faster thus creating more equity quicker.

You will get the best deals if you have all cash offers to close on the house, and you can get started a lot faster if you have cash for the rehab too.  

You'll be amazed at how much faster you save once you, hopefully, don't have a living expense.

I am not sure about your market and I know most markets are closing faster than they were, but 3 months is fairly quick.  

“Essential consumer goods or services” means goods or services vital andnecessary for the health, safety, and welfare of the public, including withoutlimitation: food, water, fuel, gasoline, housing, shelter, transportation, healthcare goods and services, pharmaceuticals, medical supplies, and personalhygiene, sanitation, and cleaning goods.c.

You may hear cost segregation and think faster depreciation, but did you know that there are also benefits to having a cost segregation study done if an asset gets damaged?