These are from fighters i've seen.

1 Sugar Ray Robinson
2 Henry Armstrong
3 Muhammad Ali
4 Joe Louis
5 Roberto Duran
6 Julio Cesar Chavez
7 Pernell Whitaker
8 Sugar Ray Leonard
9 Archie Moore
10 Carlos Monzon

Heres my other list based on just accomplishments, some of these fighters i have hardly seen.

1 Sugar Ray Robinson
2 Henry Armstrong
3 Willie Pep
4 Muhammad Ali
5 Harry Greb
6 Joe Louis
7 Roberto Duran
8 Benny Leonard
9 Jimmy Wilde
10 Sam Langford

Top 10 Hardest Hitters Not In Order

Julian Jackson
George Foreman
Earnie Shavers
Wilfredo Gomez
Thomas Hearns
Rocky Marciano
Jimmy Wilde
Archie Moore
Sandy Saddler
Mike Tyson

Top 10 Most Skillful Fighters Not In Order

Roy Jones Jr
Pernell Whitaker
Ricardo Lopez
Floyd Mayweather Jr
Sugar Ray Robinson
Sugar Ray Leonard
Alexis Arguello
Salvador Sanchez
Shane Mosley
Muhammad Ali

This list was based on fighters where i have seen plenty of footage of them.

Top 10 Most Exciting Fighters

Aaron Pryor
Bobby Chacon
Arturo Gatti
Julian Jackson
Thomas Hearns
Humberto Gonzalez
Danny "Little Red" Lopez
Jeff Fenech
Terry Norris
Nigel Benn.