scholar said:Of the men riding at the moment: Cancellara, Evans, Kwiatkowski, Valverde, Wiggins.
I think part the question of who's the most versatile depends on whether versatility refers to the ability to in a range of different kinds of races and on a variety of parcours, or to the ability to win races in different ways.
(Note that by neither definition does either Sagan or Gerrans count as versatile.)
The kind of stages/races Sagan has won:
Hard uphill finish (Chieti)
Cobbled classics (GW and E3)
Flat sprints (numerous, including one in the Tour)
Two (or more?) prologues
Mountain stages (Tour de Suisse)
Hilly stages (the hard one in T-A '13 as a prime example)
What more do you want? He can sprint and he can win solo and win in a TT as well.
Edit: How many can win a flat bunch sprint in a good field and also win from the bunch a stage like this:
That climb is 12.2 km @ 6.3% average, clearly with some harder sections.
What does the stage result tell you regarding what kind of riders that stage suited?