Consider this though.
With SFR it's an all or none proposition, meaning that either it's vacant or it's not vacant. With MF it would be extremely rare to have 100% vacancy. Most deals you can determine the 'break even point' for the vacancy rate and then decide if that's feasible. Vacancies are the killer in rentals, especially SFR.
In addition to that, the 'equity' you have in SFR is more comp sales driven and less operator efficiency driven. If you're in a hot real estate market a SFR may improve in value even if you are a bad operator, which can be nice. However, the opposite is also true. MF values are driven by operator efficiency.
As an example. Lets say the market Cap Rate is 7% for a class C fully stabilized property. If you're an efficient operator you can drive equity by increasing your NOI. As a SFR operator whether you're efficient in your management of expenses or tenant selection, it's only worth what the other SFR sales in the area are worth, give or take a small margin.