Have sailed both DCL and RCCL. Loved both but RCCL is now my number 1. The Oasis class ships are amazing and I'm sure everyone in your family will love it. So much to do for everyone. The one thing I would keep in mind if you choose DCL is that, if your daughters are into the princesses or even other characters, you will spend a lot of your time in line waiting to meet them. To me that was a big time waster. Others don't mind that so much.
If it was my choice I would do the 7 day RCCL. Splitting it means you waste most of one day disembarking and then embarking again plus you have to do two safety drills. Will your daughters find that interesting or will they be bored for the day?
If it was my choice I would do the 7 day RCCL. Splitting it means you waste most of one day disembarking and then embarking again plus you have to do two safety drills. Will your daughters find that interesting or will they be bored for the day?