Academic referees: course organisor vs project supervisor?
You should provide the names who know about your academic background and research ability very well. So he/she could be your Master degree professors or supervisors. In my point of view, you should provide a name who was your project supervisor as well as professor. 

As per your question, I can suggest you the following two names.


One from your master course department (who has a better overview of your work and achievements during your Master studies)
One who supervised you for some weeks. Because short term project supervisor would write good about your research ability.