Quote from @Thomas Haessig:
I have two accepted offers to buy and house hack. One is fourplex near downtown of Union city new jersey and the other a duplex in jersey city heights neighborhood. The fourplex looks like it going to cash flow much sooner but the duplex appreciate more? Does anyone have experience with this and have a suggestion of which to go with? Can provide more specific details if interested in helping.
Is this your first house hack? How familiar are you with the rental laws in each area?
Union City I tend to avoid, there are a few pockets that work for MTR but for the most part the city's rental laws make life very tough for landlords. Jersey City tends to fluctuate with rent control laws, right now they are more favorable for landlords then they have been in the past.
Of these properties do they have parking and how close to public transportation are they? What type of strategy are you looking to implement; LTR, STR, MTR other?
Are you working with realtor and has that realtor house hacked before?