But for PvE, I would say either Xerofour or Rakez, thou ofc it matters in wich guild they play, since it's progress that makes them so good (atleast IMO). Aldriana is also on top 5 atleast, cos of all the research that he does for the class and shares it with rogue community.
For PvP, with Woundman and Reckful gone (atleast for now), I would say Neilyo or Khuna.
For both, it's the Tauren Rogues, all of them. You gotta be the best to stay in shadows for so long without anyone noticing you even exist.
Achievement points in the world
Enfer - Eonar in US - 14,620pts
Kajn - Aegwynn EU - 2,548pts
Khùna - Archimonde EU - 3,174pts
Mirzka - Stormscale EU - 2,778pts
Sympathy - Tichondrius US - 2,899pts
Fartzwrgoben - Perenolde EU - 1,451,219 hks
There are 34 Rogues all on 392.1 gearscore, so we cant pick a winner here! lol
(but its worth noting that Enfer from US is one of them)
(all taken from various sources which are usually reliable but i cant confirm this)
Obviously the question of who is the most SKILLED Rogue is a matter of opinion, so its impossible to list anyone here ;)