Whether you choose highlights or opt for all-over color is up to you and the type of style you’re looking for. It can also depend on how many gray strands you have. For example, if your hair is almost completely gray, you’ll want to consider a complete hair dye since there’s more surface area to cover.  On the other hand, if you have just a few gray hairs here and there, then some highlights can target those stands and blend them into your natural hair.