portfolio of multi fam with 15 doors, vs apartment of 15?

[Account Closed]

Theoretically, would you buy a portfolio of 4 Multi family houses with 15 doors, or would you get an apartment building with 15 units?

Obviously there's a lot of economies of scale with 15 units in a single place. The cost of replacing 4 roofs versus one.

But you also have perhaps ease of liquidity of selling off multi-family homes one at a time. Is that the only benefit? 

I also see some difficulty in opening 5 loans at the same time with the multi family route. Any have suggestions on how to approach the bank of such a portfolio?

Any other thoughts?