We always do 2nd, it just give you so much more time. No rushing back to the boat from an excursion or CC. It gives you more time for movies, and spa visits. If you think you may get hungry, stop by a QS for a bite, Cove Cafe or something from room service.
And if your on a 7 night or longer and you have the formal or semi formal night, so much more time for primping! And on vacation we always stay up later.