It depends which you think you would wear more regualrly and what you already have in terms of a watch or studs earrings. IMO diamodn studs and a nice classic investment piece watch are jewelry basics. They are both staples so which ever one you have your heart set on more and would get the most use out of should come first, but you should get both eventually! If you are going to get a good size stud, definitly get screw back to make sure they are secure.