If we are unable to sell it before we are ready for our quadplex, the local move and reset cost on some other land will be minimal and we keep renting it nightly or monthly.  

Of the two, I would tend to go with the younger tenant with minimal credit history.  

I'm 36 years old, probably should've started this sooner so I don;t have any more time to waste.

You have minimized the risk by removing much of the speculation in real estate.The knowledge you have about your market is by far more than anyone else has.

So then a couple weeks is wasted.

In the current environment the renewals each year with a minimal increase have been a win -win for the landlord and tenant.  

I also did the abundance edu (scott yancee) before the FB and boy was that a waste ($1000 split with a friend) that was about 90% upsell and 10% useful info if that.

In general I do find quads typically do have twice the cash flow and/or equity gain of duplexes but not in your scenario where the rents of property are virtually the same.From the info provided I would definitely choose the duplex but there was minimal information provided. 

When I took the listing last year I knew that there would be minimal maintenance or service issues. 

The requirements here are very minimal, much lower than our own standard.