FWIW, I experimented one year and sat in many sections of the Met. The overall problem is that the opera house was built for opera, not for ballet, and the horseshoe is very deep, so even if you're in the most expensive seat, center parterre, you're very far away from the stage. This is unlike the State Theatre, which has a much shallower horseshoe (and also has enough ladies rooms, so there is never an impossible line at intermission). But I digress.
Now I always sit in the Orchestra, although that has its own problems, depending on where you're seated and how tall the person in front of you is. But before I could afford Orchestra seats I used to sit in the Side Parterre, boxes 5, 6, 7, or 8. That way you're closer to the stage, even though a small portion is cut off. If you sit in the Side Parterre, it's essential to sit in the first row of the box. One must make this very explicit when ordering Side Parterre tickets.
Seating preferences are so much a matter of personal taste.