When you decide to take a photo, how do you decide which lens in your bag to use? to be a bit more specific...ex. a table top shot where you could use a longer lens from a farther distance or a shot focal length and be closer to the subject.
You could use a 150mm at x distance away or a 300mm at x+ distance away.
Assuming both lenses are of equal quality, contrast, sharpness etc. I know that in portraiture shorter lenses will magnify certain features but subjects other than portraits.