Whirlipede majority because of its design beats Garbodor's. I have used both at least once or twice in battle, and have had to battle against them too. For me using them, Whirlepe was much better. Having to battle against me, I had lots of trouble beating both, on that one both tie.
Overall Whirlipede wins against Garbodor. In my game both are in the PC box, why? look at my trainer's card in my signature, I love those better.