Is it better to pay cash, or get a mortgage?

[CJ Infantino]

Hey all,

I am looking at getting a few of my first rental properties. They will be single family homes most likely. 

I was wondering what everyone's thoughts were on mortgages vs paying cash. The average price I am looking at is around 30K for one house. 

I can either pay cash for one, or mortgage and buy a few properties. 

My thought on getting a mortgage is that I can either 1) buy more properties, and/or 2) make more money in the market even with the Interest rate on the house. 

Any advice would be helpful. Thanks.