M1Q3) Which research methodology is the most important in psychological science, and why?

(Note: A reasonable case could be made for several different methodologies - and reasonable arguments could be made against each. So it is expected that not everyone will argue for the same one. The point of this discussion is for the class to make the case for and against as many methodologies as you can, in order to highlight the strengths and weaknesses of each. Please do not short-circuit the process by trying to split the difference and say something like "each is important in its own way." Take a position for one methodology and argue for it. And/or argue against someone else's position. Only AFTER everyone has made their case is it OK to go back and try to sum things up in a more measured way: thesis, antithesis, THEN synthesis.)