I am currently on SB Pursuit - 21 day Antarctica (6), South Georgia (3) and Falkland Isl (3). Our first SB experience and this is expedition not regular SB. We do love O. We have been to Antarctica before on a very scenic cruise through.
So far we finished Antarctica and are on our way to SG...we did not get this ice dock experience mentioned above. Our "6" in Antarctica was technically 5 days of landings/zodiac rides and the 6th was really at sea with a stop at sea near a Shackleton historic monument to see with commentary and binoculars. We had 1 landing on Antarctica mainland. The other 4 were islands. We did not go as far south as the Antarctic Circle. So far, caviar has been missing from all events/dining but we plan to have it sent to our room later today to fix that. Even with these small disappointments, I would recommend SB for Antarctica.
Both scenic viewing and landings have their merit. Antarctica is AMAZING and you should see it one way or another. We are here again because we wanted "feet down" on Antarctica. You get more close animal experience with SB. This alone makes it better for me than scenic cruising only. All experiences- zodiac cruising or landings/ hikes are 1-1.5 hours each. If you are not able to "hike", you can at least go to shore for a bit. They will be return you earlier if you want.
For other destinations...I think I would prefer O. O has better food, no formal night on any of their ships, decent amount of overnight stays.
Of course cost comparison could flip that.