How do airplane "life jackets" compare to marine life jackets?
Source - Been a pilot for years. Sailboat liveaboard for 1 year.

Aviation life jackets are reliable, but the overall intent is for a rescue operation to occur within hours.  One piece of advice is to stay away from debris.

Marine life jackets are designed to provide flotation for a longer amount of time.  They are also more durable due to the material in which they are constructed from.  Marine life jackets are also designed for multiple uses.