[meaubry]

Given only the 2 choices - either could be correct depending on the what the student is attempting to get out of the program. Some will learn more by design and don't want to build (nothing wrong with that), while others don't care much for design but really get into building (nothing wrong with that either)
My choice would have been - Engineer/Mentor/Student Designed and Engineer/Mentor/Student Built? In my humble opinion that is the best of all worlds and there shouldn't be a need to pick 1 or the other of the 2 choices that cannot optimize the overall experience of participating in both the Design and Build.