I've been on 3 cruises, each & every time insisting on having the earlier dinner.
You are always sooo busy during the day, and to get back shower/dress for about 6:00p is way too much! The later dinners are truely better. If you have a young one, a nap is a good idea in the afternoon with the later dinner. If I'm not mistaken you may be able to take the dinners back to your room also.
Enjoy! I can't wait till I can book another cruise...
8/08 off site @ friends Time Share