Once upon a time the NIT was the must see tournament with better teams and was actually made before the NCAA decided to do a postseason tournament. Many teams played in both tournaments but the NCAA was, and always will be, a control freak (big surprise) and eventually prohibited teams from playing in both tournaments. In 1970, Marquette was the 8th ranked team in the country but the NCAA wanted to put them in Texas instead of Ohio. So they declined their invitation and went on to win the NIT. The following year, the NCAA prohibited teams from postseason play if they decline a NCAAT bid. Then the NCAA expanded the tournament to essentially put an end to the NIT.