@liberty176 Definitely the one on HAL if you have 100% decided that you would like to do just the cruising in Antarctica.
However, if you are still open for consideration, I would strongly recommend to do the expedition cruise to Antarctica. It will be shorter and more expensive, but worth every penny as it's once-in-a-lifetime for the most of us.
For me, if we are going all the way over there to that part of the world, you might as well step outside and set your foot on the 7th continent. I am taking Seabourn Pursuit on December 17th-December 28th to Antarctica this year and am looking forward to it.
Hope you decide soon. Enjoy the time with your family!