I've always been a per-project type of person. If the requirements are clearly defined up front, you as the developer don't need to worry about scope creep. Obv

I've always been a per-project type of person. If the requirements are clearly defined up front, you as the developer don't need to worry about scope creep. Obviously, this is a double-edged sword if you find yourself in a position where something takes you longer than expected. But if that's the case, that's really your own fault - not the client's. It seems to be the most equitable basis IMO.