You don’t say how far out you are, but they don’t always open all the MDR for reservations. Usually, they open 2 of them and closer to sailing, maybe all 3.
We were on CB for 6 weeks and all the MDR’s were DMW, like Anytime, including the Palm. But, we easily picked a MDR, same time, same table for 2, so it was like TD in the midship, deck 6.
So, I would pick whatever I could at this point and change it later as they should open another one. If you’re close to sailing, then they may be full. Don’t hesitate to reach out to the Dir of Restaurant Operations when you get OB, if you want to change your MDR.
The Palm was the least crowded, so many decided to dine there. So it all works out.