Muscle shape is going to be determined by the oft-referred to but rarely defined "muscle belly." It's like this: tendons hold your muscle to the bone. The genetically pre-determined arrangement of fibers in the muscle tissue, and then the ratios in length between the muscle and its attaching ligaments speak to what shape your muscles are going to have. You can make them bigger, but they're going to grow in the same general shape as this pre-determination.
At the borders, there probably is some give: Arnold talked about being able to work on peaking his biceps, and selected exercises accordingly (though his biceps had a strong peak from the very beginning). Science is against Arnold here, but I wouldn't bet against him - but in general, there's not much you're going to do about shape.
One's not more useful than the other. There's isn't a difference in athletic performance due to muscle shape. And within very small margins (toonces' 95+% probably isn't inaccurate), there's not much to do with shaping (other than size and bodyfat).
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And you're looking at your claws and you're looking at your fangs. And you're thinking to yourself, "I don't know how to kill the bunny."
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