I've been giving it a lot of thought and I can't decide who will be ranked highest historically. All four guys have had great careers and all have positives and negatives that cause me to constantly change my mind based on how I weigh my criteria. To be clear, I'm talking about which guy has the most impressive legacy and will go down as the most "historical" fighter. Here is how I currently break them down:

Floyd: Undefeated, multi-weight champion who has reigned as P4P #1 for years. He has defeated solid competition in guys like Diego Corrales, Jose Luis Castillo, Canelo Alvarez, Miguel Cotto, Oscar, and Ricky Hatton. His signature win, in my opinion, was his domination of #3 P4P (at the time of the fight) Chico Corrales. Floyd used angles, beautiful combinations and a debilitating jab to the body to completely outclass a dominant fighter who had been blowing out top competition for years. The knock against Floyd is that at times his style is less than exciting, many of the biggest names he fought were past their best (Oscar, Shane, Cotto...etc.) and that he missed some of his biggest/best opportunities (Kostya, prime Shane, Frietas, Casamayor...etc.), most notably the superfight with Manny.

Manny: 8 division titlist and multi-weight champ who energized the sport with his all offense style and has beaten arguably the toughest competition of the four mentioned. While Manny has suffered a few draws and losses, many argue that is due to his always seeking out the toughest challengers available. Hard to argue with a guy who started at flyweight and took on the toughest available competition up to jr. middleweight. Some of the names on Manny's outstanding resume are: Barrera, Marquez, Morales, Bradley, Hatton, Cotto, Ledwaba, Mosely, and Oscar, many of were much larger and stopped in fantastic fashion. Manny's signature win would have to be his first win against Barrera, who was coming off the Hamed win, revitalized and ranked #3 P4P at the time. Manny completely savaged him and stopped him in impressive fashion. The knock against Manny is that some of the names on his resume (Oscar, Shane, Margarito...etc.) were past their best, he lost and drew during his prime (JMM and Morales) and never was able to face his greatest rival Floyd Mayweather.

Hop: Fastest title defense/knockout at middleweight, Record for successful middleweight defenses (20), won lineal light heavy title multiple times, first to unify all four major titles at same weight, oldest fighter to win titles, oldest to defend and oldest to unify. Fought solid competition, second only to maybe Manny, fighting names such as Calzaghe (#2 P4P at time of fight), Taylor, Pavilik (#3 P4P), Tarver (#6 P4P), Roy Jones, Winky Wright (#3 P4P), Glen Johnson, Tito Trinidad (#2 P4P), Oscar, Cloud, Joe Lipsey, Dawson and Pasqual to name a few. Wins over Tarver, Pavilik, Wright, Oscar were impressive, losses to Joe C. and Taylor were disputed. Signature win was over Tito in a fight that Tito was heavily favored to win. Hop turned in the most complete performance against an ATG of anyone on this list, literally dominating every aspect of the fight (jabbing, defense, combinations, body work, mental game, dictating pace and distance, center of ring, off ropes...etc.). The factors against Hop are that his style is frustratingly boring against the wrong opponent, he lost to Jones and Dawson convincingly, Taylor and Joe C. disputably, and a couple of his big wins were against guys coming up (Tito and Oscar).

Roy: Unified light heavyweight, physical phenom, won title at 160 and heavyweight, 4 weight titlist and P4P #1 for numerous years prior to suffering first legitimate loss. Roy beat the weakest competition of those listed, beating guys like Montell Griffin, John Ruiz, BHop (who was green at the time), Virgil Hill, and James Toney (#2 P4P at the time). Roy's signature win is easily his domination of Toney in a fight Toney was favored to win when James was undefeated and identified by some as the next Marvin Hagler. Roy used his considerable advantages in speed and athleticism to completely dominate and outclass one of the most feared fighters at the time. The knock against Roy was that after the Toney win he never pushed himself again until facing Ruiz, who still was the weakest of the titlists available and not the true champ at Heavy. Roy missed more big fights/challengers than all three other fighters combined. Also, Roy was not able to bounce back from losses like Manny and Hop were, and suffered some horrific stoppages while still in or near his prime.

At this point I rank them Hop, Manny, Floyd and then Roy in that order. Roy frustrates me because I feel that he was potentially the best fighter of the group, not in terms of learned skills but just in his freakish ability. I place Hop and Manny over Floyd based of level of competition, and I place Hop over Manny due to the fact that his historical accomplishments will last for decades and Manny's, in my opinion, are not as impressive. Interested for alternate points of view though.