If the system is supposed to be so simple, why can't a human walk me through it in a couple of hours. 

Then I would only offer a deal that was SIMPLE.

Simple maintenance stuff.  

Rently has been working for me its pretty simple, the only Issue I had was with stupid people not following directions when putting in the code to open the lockbox, but I was able to walk them through it on the phone.

Which one (usually, and I understand it's not simple) has a better resale and long-term potential?

This is where a simple, old school paper application/word document will serve you well. 

I suspect a simple search of public records would show who they are .. there cant be that many companies with 150 plus SFRs in that market ?? 

Plain and simple.

Simple answer networking, I can get as many as I want in my market.

Something simple and low work, instead of a rehab, to get my feet wet without too much risk?