Over summer, my best friend and I embarked on a week long sailing trip around the Turkish coast. Having done Sail Croatia a couple of years earlier, I was keen to check out how Sail Turkey compared. Here's my reflections, which I hope help you if you're torn between the two trips.
It depends what you're after. If partying hard every night is your thing, I'd go for Sail Croatia. If you're into more chilled out time, more swimming time, and a lot more time on the boat, go for Sail Turkey.
My advice would be to do Sail Turkey. Stunning water, knowledgable crew, fun stop offs, and generally a more chilled out environment. Sail Turkey is also sightly cheaper - coming in at £486 if you book early-ish, with Sail Croatia being £549.
For more, check out: https://www.topdeck.travel/tours/blue-lagoons