The Big Ten is pretty widely regarded as the best conference in the nation this season and rightly so. The Big Ten has 3 top 10 teams that can win a national championship in MI, IN, and MSU. There are another 3 teams that are tourney locks and could make a deep tourney run in UW, OSU, and Minn. There are 2 more bubble teams in Iowa and IL, and Purdue and Northwestern are hardly pushovers. 5 teams are currently ranked in the top 25, and 7 teams have been ranked during the year. Kenpom currently has the top 6 teams all ranked in the his top 14, and Iowa and IL are in the top 30. Solid resume for a conference. Most of college basketball can't even get close in any regard to the Big Ten, except the Big East.
The Big East has a pretty good argument of their own, but I don't hear many people talking them up. The Big East will probably get 8 teams into the tourney, and would probably have 9 in UConn were eligible this year. There are 2 top end championship contenders in Louisville, and Cuse. There are currently 6 teams ranked in the top 25, and Kenpom has 6 Big East teams in his top 25.
Maybe it's not enough for them to win the argument they are the best, but they should at least be in the conversation.