There are many reasons for inking before or after watercolor. You may find that you prefer one to the other, or it may depend on the occasion.
It's easier to remove pencil marks before watercolor if you ink first.
It saves time because you don't need to wait for the watercolor paint to dry.
It's easier and neater because it's almost like coloring in a coloring book.
Some ink isn't waterproof, so it needs to be applied after the watercolor.
Some colors are opaque and cover the inking too much.
It's great for adding details to your watercolor art.
Do you like inking before or after painting with watercolor paint?