Just list off some names come to your mind and who you think was the best counter puncher of the heavyweights
In all seriousness, Mike Tyson. He's the epitome of a technical, mechanical, aggressive boxer puncher. Preferred to work at mid to close range, counter your shot and follow with a combo.
Ali was the fastest counter puncher in heavyweight history, specifically his counter right, he also had a sharp pull counter that no other heavyweight did in their fights. Tyson was an amazing counter puncher.
Usual suspects: Mike Tyson Muhammad Ali Joe Louis Evander Holyfield Followed by: Jersey Joe Walcott Chris Byrd Jerry Quarry Zora Folley Jimmy Ellis Luis Ortiz Sultan Ibragimov 'Big' James Toney