Well, I haven't played any of the routes in the EX version all the way through yet, but from what I played of the Saya it seems serious enough. Either way, as to how much I'll cry? I'm not sure, I cried atleast 5 times or so when watching Clannad for the first time, but only once in Angel Beats, and none in Kanon. I do doubt that ill be able to refrain from crying at all, even though I do know how the routes end in the game, but I'm thinking it can't possibly be as bad as Clannad.
Ill go with option B for now, until i finish up the game again. Somehow, I am more emotional now than i was when i finished the original game two years ago.