Most Helpful Guy
Some guys like to be dominant, some like submissive, some like neither.
of those groups, the guys who like to be dominant are -probably- the biggest of the three groups.
However people vary in how dominant they like to be (just like girls vary in how submissive they like to be).1
Most Helpful Girl
In my experience, personally, men don't want a girl who is wholly submissive. AKA a total doormat. Challenge in debate and conversation is sexy, so is a girl who knows what she wants, what she believes in, and is willing to assert that. If you're just a "yes sir" type of girl, you'll likely only attract a limited number of men. I say submission must be earned.
If we're just talking sexual though, that may be different.1