We were in a mini-suite on the Dolphin all the way forward. I will tell you that if you are anywhere in the middle of the ship you feel overwhelmed with the amount of people looking down on your balcony. Either forward or aft would be better, the further away from the middle the better. The only thing I could think of between the Dolphine and Emerald would be one less deck looking down on you; however, remember people can look up at you too.
Lots of luck!