From experience, my net worth prefers single family residence (SFR).
With the SFRs:
The tenant stays for longer period of time.
The tenant takes more pride in ownership and can be held responsible for landscaping (with the right lease).
Tenant is responsible for all utilities
Over the past 5 years I have seen greater appreciation with the SFRs
Easier to get financing on an SFR and the loan rates are somewhat subsidized in the USA for loans 1-10.
Easier to resell. Fix-up and a few accessories are appreciated on an SFR and you can get a premium from a SFR buyer. The buyer of a multi unit building is not as emotional and usually interested in only the numbers/ROI.
With the Multi Unit Buildings:
More vacancies. More turn over costs.
More landscape issues with tenants leaving trash, since it is "not their yard". Overall less tenant pride and accountability.
A large water bill - tenants will not bring leaks to your attention since they have no incentive. (Sub metering is a possible option but may lead to more vacancies).
Multi Units Buildings often make more financial sense on paper but the reality is different.