Aft facing corner suite. Higher or lower decks?

[amyhphoto]

I am going to upgrade to a corner suite on the Edge. I can choose deck 11,10,9,or 7. Id like to hear peoples opinions on higher vs lower decks on aft facing suites in particular. Thanks! 

[LHT28]

usually the lower decks have larger balconies   but also may have more vibration from the engines/thrusters etc

 plus you may be overlooked from above

I would check the deck plans  & maybe  ask  on the specific cruise line forum

JMO