Total Solar Eclipse of 2021 December 4
 in Antarctica from the icecap, an eclipse flight or cruise

There are three possibilities to witness this eclipse: seaborne from a cruise ship, icecap-borne, or else airborne from an aircraft. Weather-wise the airborne option is the only one that can nearly guarantee you to see it, moreover with a totality duration at its highest. The icecap "ground" option has reasonably good weather prospects, while the seaborne one is questionable although thanks to some mobility your chances become acceptable. Budget-wise the least expensive option is the airborne one, followed by the cruise one and last the "ground" one. In the end your final choice will necessarily be a compromise based on your expectations and preferences, each option having its advantages and drawbacks.
The chart below does provide some clues, knowing that viewing from the icecap will most likely not occur from the centerline because of logistical constraints and as such is outside the frame of this graph. One can notice that the airborne option offers a greater totality duration while at the same time almost guarantee to see this eclipse contrary to other choices. Durations are computed for the centerline at the indicated elevation: for example FL390 means "Flight Level 390" or 39,000 feet (11,887 meters).

It’s obvious that the solar elevation will be the most favorable for the eclipse flight to the point of maximum duration, but also for an observation from the icecap. Cruise ships passengers will have at best an elevation of about 9 degrees at most as they can not go farther than about 61 degrees south because of the drifting pack ice. The eclipse flights at sunrise are a special case because thanks to the horizon dip the eclipse will be at about 3 degrees above the horizon, less if there are clouds at the horizon which is likely.
In any event this Antarctic eclipse, likely to be unforgettable, should not be a miss.