They have both offered their services and have asked me to consider them.My intuition says NOT to mix business with tenants.  

Trust your intuition!  

I want to make my business as intuitive and automated as possible so one day when retirement is around the corner, I know my family will be taken care of and my contributions will aid in providing financial education to my future generations.Please visit my profile for a little more about me and future RE goals.

Get to the point where you have an intuitive idea for what deals look good, so that you can pass on the 99% of mediocre/crappy ones, and only investigate the attractive few.You need to learn to value deals better than the realtors, because their incentive is to complete a transaction and move on, unless you have a demonstrated capacity to do several deals in the near future.

I use a combination of Google Wallet, Intuit Payment Networks, Chase QuickPay and a couple other electronic payment vendors.  

intuit gives the name of the tenant/payer on the transaction. my bank says "intuit payment/the name" or something like that. 

It's counter intuitive:  the lower your rent, the higher the problems.  

So long in fact that I was one of the original Beta Testers when it was first being developed by Intuit.

You just got to use your intuition and try to make the best decision.

Seems counter-intuitive, doesn't it?