Price so near, location consider same...
Sure go for new unit, at least got defect period after VP. Wait 3 years not an issue if that house is for self-stay.
Nowadays house 5 years also start got issue d, when see the old house, owner might already do simple aesthetic touch up for buyer to see.
Now see no big dog no 6 cars, after buy over old unit might have giant dogs + 12 cars the next morning (coz ur potential neighbour also tot no other cars will fight for roadside parking)