For me it's definitely Weird Al. I think I love his live performances more than those of my favorite band of all-time (Reel Big Fish for anyone wondering), mainly just because I love how energetic he is and how beautiful of a show he puts on, it's like there's no stopping the guy! He's a pure class act, as well. Hope that someday soon I'll get a chance to see him live for a third time. Ice Nine Kills and Descendents come pretty close to that also.
What are your guys' picks for the best live shows or concerts you've experienced in person? I'm very curious. :^))