One main difference is that nail dips get their colour from powders that are “activated” using a liquid activator. Also, a huge pro is the fact that you don’t need to cure your nails using UV light.
A dip mani lasts as much as acrylic nails but it has way more benefits: is gentler to your nails, safer and a time saver. Also another main difference you’ll notice is in texture - Gel Polish is a little smoother than Dip Powder, and durability - Gel Polish will last a solid two weeks, but Dip Powder can last three or more weeks.