Using Cash Only vs Using OPM financing

[Simon Everett]

I am a senior in college right now.  My fiance will be going to medical school and I will get a full-time job when I graduate.  I am however, interested in building wealth through real-estate.  The only thing is that I do not like the idea of using OPM.  I have no credit, never taken out a loan for college, car or anything.  Paying cash is always best in my mind.  My goal is to buy at small single family home and build my portfolio over time eventually replacing income.  With cash you have no mortgae payment meaning more cash-flow.  What are yalls thoughts on cah only investing?  Besides the fact that it is obviously slower to do. 

OR

Tell me why you think that using OPM is just as good