Recently I saw a few videos on Youtube demonstrating how off-camera flash can be used instead of the strobe to achieve the same results. It also further said that flash are more flexible in the sense that they can be tucked away behind a certain object and not be seen in the frame and so on.
My question is, what is the pros and cons of using a flash instead of a traditional strobe? Does the power output has anything to do with is? In what situation would it be more suitable to use one over the other?