It's a claim made whenever there is a big derby on the horizon.
"This is the biggest derby out there," someone in the know will say, and everyone will nod their heads until the next one comes along when the same thing is said again.
David Moyes, Wayne Rooney and Steven Gerrard have all extolled the virtues of this weekend's clash between Manchester United and Liverpool.
That game isn't the only show in town - of course there is the north London derby too, which fans of Arsenal and Tottenham will say is the best game around.
So with all the talk ahead of these two games, we decided to do a bit of research to find out which game in the Premier League can rightly claim to be the best one out there.
There are of course plenty of different ways to judge a derby - passion, performances, goals etc - but we've gone for how close the two teams have been over the years.
We've looked at the games between the two teams since the formation of the football league back at the very start of the 20th century and counted how many games they've won, then looked at the difference between the amount of wins they've had each.
The theory being that if the derby is regularly a closely-fought contest, it's more likely to be a batter match-up.
Make sense? Right, click through.
All stats courtesy of Soccerway.