While that's a good start, the rules vary from state to state and there can even be variations in different counties within a state.

The monthly variation in ACTUAL cash flow is part of the risk that allows us to demand a proportionally higher return from our investment than say a physical bond with a defined coupon rate.  

I think there's of course many variations of the same answer here and mine is probably no different!

Its 2008 all over again with expected differences.Remember that there is always a silence before the storm and only well seasoned investors  will see slight variations.

Quote from @Oscar Rizzo:   There is an online calculator app that can show you most of the variations you are looking at (www.undebt.it) It can show you the various payoff methods debt snowball(lowest balance first, debt avalanche(highest interest), cashflow(debt that have the highest impact)  You can run any scenario and it will show you payoff dates for each, you only enter your account names, balances and interest rates.

Here in St George, Utah, my BIL has a couple variations.

Even if you have no need for the work instruction, I suggest you use multiple tools as I have experienced large variations between the tools.  

Generally west Germantown is looking more attractive, but even within that there is huge variation.

I'm a firm believer that - within the "reasonable parameters" - there is no wrong or right, just variations of things of which some will suit person A and other(s) will suit person B.As a very general approach I would say that if you plan on building up a cash-flow generating "empire" you probably want to leverage as much as reasonably possible so as to rather quickly increase the numbers of units you own.

Which if youve done flips , but not commerical multi before, you wont miss much,  however a 6 fam is a commerical code permit so there are slight variations between the residential code for essentially all trades which if you dont have a detailed plan and you dont double check every code before you do anything but rely on cheap labor to do your due diliegence for you, what could go wrong ?