Nobody should want to travel back in time to visit Pompeii
Herculaneum had a much better view.
Vesuvius was a very flat mountain at the time of the eruption. Pompeii was on a river and was more of a commercial harbor view. Herculaneum sat directly on a beachfront terrace looking straight out over the clear waters of the Bay of Naples.
Herculaneum was also much closer to the volcano, so the view from there would have been far more dramatic. Being on the western side, they would have seen the initial explosive column rising right before their eyes. Pompeii, being further away to the southeast, was a more oblique view.
Get it right people. Visit Herculaneum.