Cactus 1549 was a premeditated ditching, albeit with only 90 seconds notice. The aircraft was ditched on a flat-calm, inland waterway in good visibility. The modern construction of the airframe no doubt contributed in some degree to the hull remaining intact. Those factors gave the crew the best chance of executing a successful water landing. Had the crew been presented with the same scenario in open coastal waters, even with a slight swell running, the outcome would have been very different.
I am struggling to recall an accident involving a jet aircraft ditching in the open sea that had a good outcome..... regardless of it's attitude at impact.