Seems like Team 1 is being undersold here.
I will do the honors:-
About Darth Revan:
From KoTORCG:Darth Revan was one of the most powerful Sith Lords in galactic history.
This statement is self-explanatory.
About Darth Marr:
From SWTOR(E):Warlord and master of the dark side, Darth Marr is the most senior member of the Dark Council.
From SWTOR(E):When Marr speaks, he commands the attention of the entire Dark Council with intimidating authority and stern wisdom.
From SWTOR(E):Tales spread through the Republic of the masked Dark Council member who routed whole armies and deflected assaults more thoroughly than any planetary shield.
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To become a Dark Council member in the first place:
From SWTOR(E):To serve on the Dark Council is to achieve the greatest position of honor, power and influence in the Empire. Many Sith spend their entire lives plotting their ascension to the council, but with millions vying only for 12 seats, the competition is cutthroat. The powerful few who join the council often serve for only a few months, their lives cut short by internal power struggles or external enemies who target them for assassination.
It shall be kept in mind that competition for Dark Council occurred in excess of competition for obtaining the rank of Sith Lord beforehand.
Darth Marr acquired the position of DEFENCE OF THE EMPIRE. He held on to his position for decades and eventually became the de-factor leader of the reconstituted ancient Sith Empire in absence of Sith Emperor.
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My verdict is that Team 1 can win as well and is not outmatched in this contest.
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Sources:-
KoTORCG = Knights of The Old Republic: Campaign Guide
SWTOR(E) = Star Wars: The Old Republic: Encyclopedia
http://www.comicvine.com/profile/shootingnova/blog/darth-tenebrous-respect-thread/97317/
You can find many good feats from Tenebrous and Plagueis in these threads.
Originally posted by Intrepid37
Which makes Vitiate good, not Revan bad.
Originally posted by Arhael
A useless accolade considering that he got stomped by one of the most powerful Sith Lords in galactic history.
Anyways, Emperor Vitiate is not in this contest.