Those are completely different types of work, not very similar at all. One is research / research training, involving projects with a large scope unlike anythi

Those are completely different types of work, not very similar at all. One is research / research training, involving projects with a large scope unlike anything students have done before, unpredictable timing, a lot of uncertainty and risk, and a certain amount of personal autonomy and social isolation. The others are professional training with many small clear tasks, more or less comparable to previous schooling students already have a lifetime of experience with.