Residential vs commercial management

[Patrick Flanagan]

Hello! 
I am compiling research on starting a property management company. My personal opinion and investing strategy is that multifamily units are better than single family. But I’d assume when running a property management company multifamilies are a bigger pain to manage than single family homes. 
In your experience, is it more profitable to learn how to be an expert multi family manager vs a single family manager? My step mom runs a 300+ management business of all single family homes. She won’t touch multi family. She said it’s too much of a headache… but I’d like to learn because my next investment goal is buying an apartment complex.