I want to schedule an Australia & New Zealand cruise in January or early February of 2023. Unfortunately, I often get sea sick on cruise ships, even when seas are considered moderately choppy. Based on this, I always try to take steps to reduce the chance of encountering rough seas.

I have the option of selecting a cruise that sails from Sydney to Milford Sound NZ, or from Milford Sound to Sydney. Would one of these options reduce the chance of rough seas?