Greetings and welcome aboard the CF, Bob.
The advantages of current
control (over voltage control) in an LED light, are more consistent light output from unit to unit and a longer, more consistent life expectancy.
LEDs are current-driven devices whose brightness is proportional to their forward current
. Their light output and life expectancy are both tied directly to their operating current. The constant-current source eliminates changes in current due to variations in forward voltage, which translates into a constant LED brightness.
So, CC LEDs would definitely be worth it, for "critical" and difficult to access lights, such as anchor/steaming/spreader lights on the mast
; and somewhat less so for easily changed cabin