Well, both the Big Ten and The Big East would get 7 teams in the tournament if I had to judge before the season. Obviously both conferences are loaded and head and shoulders above the rest.
However, I still don't see a top tier team in the Big East. UCONN has had a ton of distractions of late, which makes me wary to put them with Michigan State and Duke. Villanova is right there as well, but just not there.
With that said, I'd say the Big Ten, although it's a tough call.