In every edition I've played--and I've played almost all of them at least a little, if you allow Labyrinth Lord to count in place of the edition it retrocloned--it's been somewhere between B and C, generally closer to C. And yes, this includes both 4e and 5e. 3e/PF is probably the worst, sometimes verging up into the D range. So many exceptions and counter-cases.
Though if I'm being realistic, the red circle should always be bigger than the blue circle. I can discuss the mechanics of the game for hours and hours whenever I like, because of the Internet. I get (maybe) six to eight hours of gaming in a week, and that only when I actually have multiple games to play in. If you limit things only to when I have multiple concurrent games...then maybe they're about equal, not sure.
(Math Nerd moment: Properly speaking, B, C, and D are all equivalent in terms of Venn diagrams, which simply show which relations between sets exist, not the relative "sizes" of those relations: A says the union of blue and red is empty, E says their disjunctive union is empty, B/C/D all say neither of those is empty. I'm not aware of any diagram that shows the relative sizes of sets, though, so it's not a bad shorthand, as long as it's clear what you mean by it.)