However, Commercial loans have an advantage of getting around some of the rules/restrictions that Fannie/Freddie/FHA/VA/Jumbo pose.

I'm wondering what the most advantageous way to use my rental is.

It is just easier to take advantage of markets in my price range. 

Take advantage of being young and single to do stuff like that be in a great position when you want to start a family.

The developer would like to put 6 homes on these two parcels, increasing the net yield from 8 potential homes that are allowable to a total of 12 homes.It would understandably be advantageous to the developer to utilize the private road rather than build a new road, install traffic light, etc.

You could potentially take advantage of both.

I am currently seeking out duplex properties in my farm area and I don't see an advantage of having a garage for renters.  

The one advantage for MF is you have one location so expenses will typically be less….also, if you are buying in volume, you will get a better price.

What are additional advantages and disadvantages to Portfolio Lenders?

The advantage I believe is that Quickbooks also gives me accounting and reports.