Phil's Campaign Planner series is pretty good. But really, it depends on what you want and need. Phil's books help you get organized and running. IF you deviate significantly from core races & classes, they won't be quite as easy to use. If you already have strong organizational skills, you might find that making your own is preferable.
But if you are haphazard about your campaign, the planner books might help you bring it all back under control. You could organize things together and begin putting together a campaign reference using the planners.
It really depends on what you are looking for though. Is there something specific you are looking to address by using a campaign planner?