Apartment Building Versus SFR/Townhouse/Condo

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Some google articles said (at least $1 million plus) apartment building is the best real estate investment.  

Why apartment buildings are better than SFR/Townhouse/Condo?

Is it because apartment building has better cash flow/cap rate?

If the SFR/Townhouse/Condo we purchase have the same cap rate as the apartment building, does it mean, buying the SFR is almost the same good investment as buying the apartment building?

If we can find SFR that have the same CAP rate as the apartment buildings, we can continue buying SFR instead of look for aparment buildings?

Thank you for your advice/suggestion/opinion.