Australia coach John Connolly believes the Heineken Cup was the reason his side and New Zealand crashed out of the World Cup at the quarter-final stage.
He reckons the sheer intensity of Heineken Cup rugby has made northern hemisphere nations better equipped for the pressures of a knock-out competition.
The Wallabies and New Zealand are the top two sides in the Test rankings - but found themselves second best to England and France in last Saturday's encounters.
The former Stade Francais, Bristol and Swansea boss said: "Handling the pressure of a knockout tournament is something we don't have. There is always tomorrow in the Super 14. There are enough games that if you have one bad game you can make up for it.
"There is no doubt, the Heineken Cup is very tough. The Premiership in England, you are playing for the top four, top six, promotion and relegation. They are huge stakes every week.
"It brings a different style of rugby. It is not always a better style of rugby. It is a no-risk style whereas the southern hemisphere teams play a freer style."