I am never without Granulated Garlic in my pantry. Note I said "granulated" garlic, which is different in texture from garlic "powder".
Garlic Powder is too fine for me. It's like talc - & clumps & floats in/on dishes rather than incorporating. Granulated Garlic, on the other hand, is great in & on almost everything. Free-flowing & easy to use.
I never buy or use Garlic Salt. I can add Granulated Garlic & salt to taste all by my wittle self - lol!!