Aquafaba because of an allergy, or ethical choice? Because while aquafaba is an amazing egg substitute in baking, it's no competitor against egg whites for taste. Plus, it has a shorter shelf life; a box of egg whites in the fridge lasts ages longer than aquafaba once it's out of the can.
My wife has an egg allergy; we use aquafaba when we can for baking, but it's just too hard to keep, and we usually end up using a powdered substitute.