Having done both class of ships as well, my thoughts are similar to the OP. I enjoy the more small bar areas like the S-Class ships have vs the large bar areas of the E-class. The E-Class bar areas simply feel like a large hotel bar similar to what you would find near convention centers. That fact combined with we enjoyed a real veranda and the sky lounge is one of our favorite areas of the ship; we will only book the E-Class in a Suite. S-Class we are plenty happy in a Veranda or above. Everyone has their own criteria and of course port stops play a large part of that as well but this our travel and cruise strategy currently.