Liger wasn't heel often, but when the time came he delivered. Martel was a heel on several occasions in several major promotions. A career defined as a heel, or a career with some heel highlights?
edit: Calling it for Liger, 11-2
Liger sold his leg as a trick and then did a little jig to piss the crowd off. He wins for that.
I haven't seen much of Martel's AWA work, but from his WWF and WCW stuff I can't remember a single moment when he seemed such a thorough asshole as Liger did when he sarcastically clapped for Sasuke blowing a spot in the 94 J-Cup.
One only needs to watch Liger in NOAH.