Project based v. Problem Based v. What do we call this?

There is a lot of lingo out there for problem based learning / project based learning, but which is best and what are the advantages of one over the other?  Is it a "strategy" I should or should not be using in my classroom?  This Edutopia article dissects the lingo and gives clarity to this topic.  A good read....

Project Based Learning Vs. Problem Based Learning Vs. X-BL

How do you use "X BL" in your classroom?
Discuss the impact you feel it has on your students and their learning.