Belichick has been with the Patriots for the past 14 years, during which time he has developed a reputation as one of the greatest and one of the most hard-nosed coaches of all time.
However, McCourty has admitted that Schiano is a harder man to please, after being coached by him during his college years with the Rutgers Scarlet Knights.
He told NESN Live: "Toughest coach I've ever played for? Oh, Schiano. He's more of a yeller and a screamer. He'll get right in your face whereas Bill's more sarcastic.
"Both can be pretty brutal, but I'm gonna go with Coach Schiano."