Ratio Utility Billing System vs Sub Metering

[Ken Martin]

I have a small 5 unit mixed use property in SW Michigan and am trying to determine whether I should implement a rubs system or install sub meters. Is there a rule of thumb on which to use? I got the sense that submeters  would be expensive to install, but i'm having a hard time finding a RUBS company given im only 5 units and outside a major city. Any suggestions?