Time to Purchase: Single vs Multifamily Residential

[Trina C.]

Would someone offer pros and cons of investing in a buy/hold strategy for Single Family Residential vs. Multifamily Residential (2-4 units)? Taking into account things like vacancy factors, higher rental income version multiple incomes, owner/occupy advantages & disadvantages, income and vacancy stability of the renters, maintenance and land lording issues, etc... and even 2 unit versus 3 unit versus 4 unit properties? 

Thanks in advance.