The New Jersey Devils biggest rival is the New York Rangers. There is zero argument there. Devils fans hate the Philadelphia Flyers. Many of them hate the New York Islanders, the Pittsburgh Penguins and the Washington Capitals. None of that matters, because the Rangers are far and away the biggest rivals for Jersey’s Team.
There are literally hundreds of moments in this rivalry that define it. There are the huge moments that changed who won the Stanley Cup (Henrique, It’s Over or Mark Messier‘s guarantee) to those that are inconsequential (a 10-player fight to start off the game or Sean Avery‘s idiotic shenanigans).