Paul Heyman is widely considered one of the best wrestling managers of all time due to his exceptional mic skills, ability to elevate wrestlers through his promos and storytelling, his deep understanding of the business, and his impactful role in creating the unique style of Extreme Championship Wrestling (ECW), where he was known as "The Evil Genius.".
Bobby "The Brain" Heenan is widely considered one of the best wrestling managers of all time due to his exceptional ability to elevate wrestlers through his witty commentary, masterful heel persona, and unique comedic timing, making him a standout figure in the industry with a lasting impact on the business; he could seamlessly manage a wide variety of wrestlers and turn even the most mundane moments into memorable entertainment.
I personally think Paul is better but Bobby was good.
Roddy Piper is often considered one of the best wrestlers of all time because of his exceptional mic skills, his ability to generate immense heat as a villain ("heel"), his innovative interview segments like "Piper's Pit," and his significant contribution to the popularity of professional wrestling, especially during the early days of WWF, where he was a major draw.
Piper grew the sport, not Bobby Heenan.