This depends on the types of projects. If you are doing a project where you have decent control and scope, project billing is ideal for both client and contract

This depends on the types of projects. If you are doing a project where you have decent control and scope, project billing is ideal for both client and contractor. Unfortunately many projects I work are huge and shift constantly due to other factors, people, and organizations out of my control. So going to hourly on these puts the responsibility on those managing the project.