Damn. This is a tough one. Vergo would be the easy answer but the fact is we don't know how he measures against Shanks' top crewman. Vergo is tall and muscular while Roo is short and fat. But of course, things like those never meant anything in One Piece.
I think I'm leaning more to Vergo, given the fact that we've actually seen him fight. He can use Haki, Rokushiki and it's likely that he also has some devil fruit as well. As for Roo, we only know that he doesn't hesitate to shoot people in the head while eating meat...
Razh pretty much summed it up. Roo has only been shown to fight exercise. No other choice but to go with Vergo.
Vergo wins. He has the best Busoshoku abilty seen in the series, it can't be out of the party yet.
I'm joining the "we've seen much better fighting abilities from Vergo than from LR" party.
I'll say Yonkou's top crew is bound to be stronger than a Schichibuki's top crew. it's just that we haven't seen Lucky Roo fight at all but title wise he is on par with commanders of the white beard. so i'll blindly go with Lucky Roo.
If Shank's top crewmembers are anything like Whitebeard's, then they can stand up to an Admiral, and hence very likely beat a Vice Admiral like Vergo.
I'd say, Lucky Roo.
Well, we haven't seen anything from Lucky Roo yet, but for now Vergo is a beast. With just Haki and Rokushiki he had a skirmish with Sanji, managed to take down Law and now he is also fighting Smoker, so he isn't just a Shichibukai's underling... He is damn strong. He also seems to be among strongest Vice Admirals.
Lucky Roo is one of the top members of Shanks crew introduced others being Benn Beckman, Yassop. So he is in top four of the strongest men in Shanks Crew. We have seen that Benn Beckman threatening Kizaru with a gun at the end of war. So I blindly vote for Lucky Roo over Vergo even though we havent seen him fight. The top crew members of a Yonkou should be able to hold their ground against an Admiral so I dont think there will be a problem with Vice Admiral Vergo here.
And VA doesn't rank strength that well (cough cough Garp).
But most importantly, LR is total hype, while we've seen something from Vergo.
http://www.mangareader.net/103-42471...apter-568.html for a moment while fighting with Akainu, this distracted Marco and Jozu which ended in their capture. So I think Lucky Roo will be the winner here. If I may add he is the first person in the manga to kill a person (bandit) :P
Lucky roo= marco
While Whitebeard had a huge amount of crewmembers and Shanks Crew is always shown to be a rather small group besides their fodder I always considered the quality of them to be greater than the ones of Whitebeard. Though Marco was said to be one of the toughest (the Gurousei mentioned him to be one of the very few possibly able to take down Blackbeard). So I guess Id say Lucky Roo is stronger then Vergo or at least on par.
Can't wait to see Shanks Crew fight a real battle again.