I’m no expert & can only speak about my personal experience rounding Cape Horn in 2019 on a Viking ship. All modern day cruise ships, such as Viking, have stabilizers. I experienced some fairly rough seas rounding the Cape and did not get seasick. It was something I was concerned about. I did pack seasickness pills but didn’t need them. I did notice a number of people wearing the patch behind their ear which has to be prescribed by a Dr. I did wear the acupressure Sea-Bands on my wrist. It was something my Dr. recommend & I’d like to think they helped. Location of your stateroom is an important factor to consider. Book one that is mid ship & on a low floor like my husband & I did. They tend to be the most stable. Good luck.