both sports.
Basketball has nearly double the number of competitive teams in a given season.
Football has the P5 plus about 6 other schools in a given season, total.
Basketball has a 6th major conference (the Big East--Georgetown, Villanova, Butler, St. John's, Xavier, etc.), and a host of other high major contenders that are in strong but not high major conferences. UConn. Memphis. UMass. Dayton. BYU. Gonzaga. UNLV. VCU. Northern Iowa. Wichita State. Davidson. Cincinnati. Temple. Houston. Murray State. St. Joe's. Western Kentucky. Richmond. San Diego State. Saint Louis. etc. etc.
I've just listed 30 (the Big East plus the 20 listed above) other teams. There are more.
There are 12 teams that can play in an NY6 in football. The Sweet 16 is easily the mathematic equivalent of the NY6.