Road Warriors for me, they really looked like they were in to rip your head off.
THIS!! Undoubtedly the biggest and most powerful and iconic tag team of the last 30 years. They were legitimately believable as huge powerhouse heels and baby faces. They also were one of the only guys/teams who could be heelish yet still be fan favorites. When that DONNNNNN of Iron Man would blare through the speakers, people would go through the damn roof!
But as for gimmicks, Undertaker hands down. He is the one outrageous gimmick that even though was always a little cartooney, was pulled off perfectly to make it kind of believable and entertaining. I always thought the Issac Yankem and Papa Shango gimmicks were so ridiculous and corny, but the Undertaker gimmick is the one true "gimmick" that could get over.