I have found two properties that I am interested in.  One is a four flex and the next is a duplex.  They are roughly the same amount of money to buy.  I guess I am stuck on wondering if the small amount of cash flow will be worth having 2 more units.  

The four flex is $245k and each unit rents for about $450 a month.  So $1800 @month. No word on vacancy from the listing so I guess just assume its full?

The duplex is $229k, half rented out for $1000 the other half is vacant.  I can expect to get 750 to 800 out of the other side.  To be honest I'm not sure if the other unit is actually renting out for 1k.  Thats pretty steep for the neighborhood.  

I hope that will be enough information to get some help.  I keep on going between the pros n cons and back and forth between the two.  less vacancy impact with the 4plex but more to maintain. With the duplex Ive got good cashflow from the beginning but then who knows if the high paying tenant will stay,  This could result in having to top the rent down to a more reasonable number and having a negative effect on the overall cashflow. 

Thanks for your time.