There both easily ATG.

Jones Jr Best Wins

Virgil Hill
Montel Griffin
Bernard Hopkins
James Toney
Mike McCallum
Julio Cesar Gonzalez
John Ruiz
Vinny Pazienza
Thomas Tate
Reggie Johnson
Eric Harding

Middleweight, Supermiddleweight, Lightheavyweight, Heavyweight, World champion in each of these weight classes and when he beat Ruiz for Heavyweight title that feat had not been done since early 1900s.

Floyd Mayweather Jr Best Wins

Zab Judah
Ricky Hatton
Oscar De La Hoya
Arturo Gatti
Jose Luis Castillo x2
Diego Corrales
Carlos Hernandez
Genaro Hernadez
Angel Manfredy
Jesus Chavez

Superfeatherweight, Lightweight, Jr Welterweight, Welterweight, Lightmiddleweight, World champion in all of these weight classes, without a doubt Jones and Mayweather are ATG.