Garlic powder gets no respect. Sure, the aroma and taste of fresh garlic is hard to beat, but in some situations, the dried stuff doesn’t just measure up, it flat-out wins. If you need a garlicky vinaigrette, marinade, or dip to taste great for longer than 24 hours, powdered or granulated garlic is the way to go.
source https://skillet.lifehacker.com/you-need-powdered-garlic-in-your-marinades-and-dressing-1846784686