What is the best gym equipment to use for the best overall workout?

If you went to the gym and had to choose individual one machine which would be the best for a overall weight loss.
The choices of equipement are any a treadmill, stair climber, Elliptical Cross Trainer or stepper.
Answers:
The Elliptical Cross trainer would be my choice.
Elliptical for me! it's the best imho.
i'd say the elliptical because you're using your arms as ably as your legs

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