@Od Ntuk definitely pros and cons to both. From what I have learned, your water Bill in Philly is tied to your property taxes. So it’s hard to avoid all utilities, even if you leave a property as a single family. If it’s a rental, you would have to add that to rent.
On my fundamental level of understanding, one roof for two units means two sources of income covering the loans, and all other expenses. What really caught my attention is a duplex appeals to two markets in terms of selling - 1) investors get two sources of income under one roof. 2) This property also appeals to house-hackers. That trend is VERY strong to those who want be owner-occupants.
Rentometer Pro shows $1,064 - $1,100 per unit this size. I’d rather two units at $1,100 each vs one unit at $1,175 - $1,300, even with a Property Manager.
I, also, took the section 8 Landlord class in Philly. They pay market-rent plus additional money for additional amenities like ceiling fans, central ac, and more. From the landlord perspective I would like to double my source of income.