Who had the impressive heavyweight title reign for the quality of the opposition and how they beat them?

Some of the heavyweights that held a title and made at least eight successful defenses.

Which were the most impressive, in your opinion?

Quality of the opposition and how they beat them?

Deontay Wilder has 10 defenses.

Ezzard Charles: 8 Defenses

Lennox Lewis: 9 Defenses

Mike Tyson: 9 Defenses

Joe Frazier: 9 Defenses

Wladimir Klitscko: 18 defenses

Thoughts..

Deontay Wilder
Ezzard Charles
Lennox Lewis
Mike Tyson
Joe Frazier
Wladimir Klitschko
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Who had the impressive heavyweight title reign for the quality of the opposition and how they beat them?
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