There are pros and cons with old vs new construction. I'll take modern electric wiring.My first house in CT was built in 1953 and had floors like concrete - no bounce, no boominess, rock hard. In my current house built in 1987, if I go to the center of a room and jump up and down the stuff on the dresser shakes. Everything in the current house is to code but you can feel the difference.
My house is 20 years old. The plumbing is weak. Maybe today's plumbing with PEX and whatnot is better.