Its like financial planning, risk tolerance (comfort level). If you don't feel comfortable with just a cartridge, then get a pump. If a frame pump crimps your style or your compact 48 frame, then attach the Topeak Road Morph on yourself instead of anywhere on the bike.

Its like the sport of boxing, arm punches do very little for punching power. Mini pumps rely on the arm muscles, frame pumps rely on the legs and your body weight.