It varies with different lists.
A Zek/Eels running 3-4 Thundurus will have a good match up against CMT running 4 Tornadus/2 Mewtwo
But not every version of the deck is built that way.
There's a lot of factors to take into account too.
CMT will usually have the speed advantage (and is very good at donking lone Tynamos), plus who knows how many people are going to show up to week 2 of States with Terrakion and Landorus decks?