Are macadamia nuts the healthiest?

Raw macadamia nuts are the healthiest form. Dry-roasted ones provide a good alternative if you don’t have the time to roast them yourself, but try to stay away from oil-roasted versions, which contain unnecessary added fats.

Oil roasted version, is it fried?

No it is inside Macadamia nuts with a lot of oil. The oil contains: Oleic acid (approximately 55-67%), a monounsaturated fat that can improve cardiovascular health when used in place of saturated fats or refined carbohydrates.