Personal opinion:
Rescue basket has its place for multiple, uninjured casualties but means there is no control of the casualty/casualties until they are actually in the aircraft and anyone who is too badly injured to get into the basket will need to be rescued another way.
Rescue Swimmers are good for persons in the water or trapped underwater, in caves etc but free dropping to swim to a vessel seems utterly pointless.
Winchman can be put in the water, on a deck, on a mountainside, into a building and immediately has control of the casualty and is able to assess their medical needs and treat in situ if required. We rescued someone from 8' breaking surf recently where a swimmer would have been unable to extract the casualty but the winchman attached to the wire was able to place a strop and quickly effect a rescue.