Never eaten a jack crevalle. Caught a boatload of them. As mentioned, they pull hard and will get your drag singing on light tackle. However, when fishing for something else that is edible, it's usually a bummer to see them come up and turn sideways.
I've eaten a fair amount of smoked amberjack and would suggest that over the jack crevalle. If ever given multiple choice, I'd choose smoked mackerel first. That and some good German potato salad will get your blood running.
