#1 CM Punk

CM Punk was one of the most controversial and polarizing personalities to have ever stepped inside a WWE ring. He held the ECW Championship for 143 days, before losing it to Chavo Guerrero.
Punk won the Money in the Bank contract twice, and twice he cashed in successfully to become a World Champion. First, he cashed it upon Edge and became the World Heavyweight Champion. The second time, he cashed it upon Jeff Hardy, and the result was the same.
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Punk held the WWE Championship for a record number of 434 days (during his second reign). He along with Paul Heyman, made the WWE Championship the most talked about Championship ever. He defended his title multiple times, and proved himself to be a Champion material.
Punk delivered outstanding matches and promos as a World Champion, and, he knew how to get the best out of his opponents.