I have sailed Constellation a few times. Last time a few weeks ago, in Aqua
I have sailed in both Aqua (dining in Blu) and regular cabins (dining in MDR).
Food is very subjective. Personally, we prefer dining in Blu because we think the food is better.
On Constellation they were handing out both Blu and MDR menus in case you wanted something from the MDR. There is an overlap on some items. Also, depending on timing there can be a 30 to 45 minute wait to get seated in Blu on Constellation.
Therefore in general we would prefer Aqua over regular cabins EXCEPT that on Constellation most of the Aqua cabins are on deck 9.
This is under a very LARGE overhang with struts. Having sailed on deck 9 I consider these obstructed view cabins.
Not sure I would book a cabin on deck 9 ever again.
If you want to sail in Aqua on Constellation, consider deck 11.