Why choose multi-family units than single-family homes for rental

[Johnny Youssef]

I own several single-family homes in Kansas City and they are all successfully rented out for a great return (about 14% average). I have been told by many successful investors that the next step I should look into is buying multi-family units. I am in a place where I am able to do that and I have been touring different properties (multi-families between 10-50 units) but I cannot wrap my mind around the return which seems to average around 7%. I understand that management is a lot easier for 20 units under one roof vs. 20 single homes but when the return is literally half, why should I consider multi-family? Would love to hear from anyone with experience on the two types of investments and if I am missing something.