Scenario: You are a secret agent in the vein of James Bond or the Black Widow. During the course of a mission, you are horribly injured in an experimental plane crash, and are left a twisted, mangled wreck of a human being, barely clinging to life. Luckily the medics find you and get you back to base, where the government's top bionics expert says he can save you. For some inexplicable reason, you can choose the manner of your injury/bionics from between two options:
Two bionic legs. Both of your legs would be replaced, giving you the ability to run, jump, and kick at superhuman levels.
One bionic arm. Your dominant arm would be replaced, giving you superhuman strength in that arm/hand.
Some caveats apply. In both cases, the bionic limbs externally resemble your real limbs; their synthetic nature is only detectable under close scrutiny. Also in both cases, sensation and fine motor control are lost. This is less problematic in the legs, where fine motor control is not as important, but the lack of sensation makes it difficult for you to walk on uneven terrain without watching your feet. You can run up to 60 mph, and can maintain this speed for about an hour before fatigue poisons would build up in the still-human parts of your body, forcing you to rest. From a standing position you can jump 4.5 meters straight up or 10 meters across. With a running start you can jump across spans as wide as 15 meters. Although the bionic limbs are waterproof, the legs make you too heavy to swim (you would be pulled under).
With the arm, you would lose the ability to write and perform other manual tasks with precision (and remember, this is your dominant arm). Although the arm possesses superhuman strength, it is attached to the rest of your musculoskeletal system, which does not. The amount of weight you can lift from a standing position is limited to what your still-human frame can support, probably around 250 kg for a healthy adult male. But the amount of weight you can bench press is significantly more, since that position allows the bionic arm itself to bear the weight. In this manner you can lift up to 2000 kg, enough to to push a car off yourself, were you in the unenviable position of having one on top of you. The arm can deliver a blow with sufficient force to buckle 1-cm steel plate or splinter a 7.5 cm oaken door, and if properly braced can bend steel bars 3.8 cm in diameter. The arm does not prevent you from swimming.
Answers/clarifications upon request.