I'd see which rides might be your preferred ones and do the park twice. I've been to Disney Sea once but Disneyland 6 times.
Although on last visit, the crowds finally got to us. They are just unrelenting in March. We are passing on both parks on our trip in Tokyo next March and unfortunately will not flying via HKG as it would be nice to go there again. Something about midweek in Hong Kong Disney with walk on rides in March. I think the issue was that compared to Tokyo it was night and day.