I have had a property with a $60K sewage issue (complicated as to why it is so high). 

And as the years passed, he not-so-gradually lost the capacity to actually put down his head and work hard through complicated problems with no easy solution.

If you have a problem with a tenant that is also a PM, or a contractor, or whatever, you just complicated the entire scenario and have 2 (or more) problems.Just say "no".

It’s a same about of work, and less complicated.  

But when questions get complicated, I do trust more in professionally trained humans.Software tools are great!

How ever I dont know what complications are being added cause you’re not a citizen (From what I gather in these post).

You can make this as complicated as you want but in simple terms the two can be very similar when you are using cash.  

Paying taxes on money you should receive does not apply in this situation and is much more complicated than a simple RE transaction. 

Your top 5 quick metrics you look at before moving on to a different property or performing some more complicated calculations...Not sure if this will help but I am located in Northern California, 23 years old, $90k salary, looking into SFH or small multi-family (duplex/triplex) to start out.

It's complicated, but not impossible.