Depends on the course, conditions, who's there (competitors and teammates).
But generally I'm more of a race reader / move follower than a leg breaker / RacerEx type.
This comes from my knowledge that I'm not the strongest guy there. Not even top 10, not even top 20 unless it's a really weak field.
So I have to carefully allocate my limited resources. Some may call it wheelsucking or defensive riding, I call it energy management.
I'm not a wheelsucker; I'll take hard pulls if the situation is right. I'm not negative or defensive - I'll attack / bridge if the situation is right. I'm just not the guy who hits the front, causes a split, tows the group around and then wins the sprint.