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Cardio workouts and aerobics are mainly aimed to burn fat. Depending
much on what aerobics you do, but in general your muscles will get more
toned and maybe slightly bigger and you will lose that excess fat around
your body. Aerobics will give you that slim, toned look. You have to
exercise 3 - 4 times a week to get any real results with aerobics
method. So if you are after bigger butt, the aerobics might not be your
thing.
Then why is it important to get bigger butt muscles to get bigger butt? It is because, the bigger your butt muscles are the bigger your butt will be and look. Butt muscles in good condition will shape your behind to a rounder and bigger look. So the obvious answer to the question, aerobic or weightlifting is weightlifting. If you want to have bigger butt and bigger butt muscles you need to stimulate the muscles to grow and only really effective way to do it is by exercising your butt with weights. Aerobics or cardio exercising is something I recommend to do on the side. It will make your butt stand out more if your body fat percentage is lower.