Sully vs SQ
Ditching generally presupposes loss of thrust during cruise with plenty of time to run checklists. TS 236 had 19 minutes after both engines flamed out before landing at Lajes.
Sully's situation left precious little time while he was fully occupied finding a ditching spot in a congested location. The George Washington bridge and marine traffic were concerns.
The Changi crew, most fortunately, had a number of minutes after coming to a stop on a runway.
We may disagree over which crew made the best use of their time.