The smaller ships out of Ushuaia are usually old Russian ships, converted for the trade. The trip is completely different and would likely appeal to quite a different group. I have read some of the trip reports on cruise critic, and those in the small ships are like hazmat tours. You must go through "decom" going in and out. If I were much younger, perhaps.

I do not understand about going for only one day. I am not sure that is even available. It is too far for most of us, and way too expensive and special to only get one days worth of visit. 3 days were amazing.