If you want a balcony or Promenade deck, do not go on E Class.
The Infinity Balcony is just a giant port hole!
Open the balcony window and the AC shuts off. Not fun in the Caribbean unless you love a hot room.
There is no air circulation on the balcony because it is entirely enclosed all the way to rail.
On the E Class, the life boats are sitting on the Promenade deck, so no seating except in eating areas. On the S Class, the life boats hang above the Promenade deck and plenty of seating and air circulation (wind!).
You can probably guess, I like cool wind!