The reality TV veteran, who did two days' judging on the US show this year, said that he was hoping the ITV1 show would "win" in a battle with its spinoff on Fox in the US.
"I always talk to Simon [Cowell]," he said. "I talk to Simon every two weeks. It's hard at the moment because he's in his own show in the US. But I think our show is better.
"I do talk to him though. I've worked with him for 15 years."
Speaking about which show he considered the strongest when it came to talent, he added: "I think our show is going to do better than the American show. I'm on this show, so I want this show to win."
Celebrating the programme's musical success over the last decade, he continued: "It's the biggest launch pad in the world. Look at One Direction. Look at Cher Lloyd - she didn't do well on the show - she's massive in America.
"Look at Olly. Look at JLS, One Direction, Leona Lewis. It's a great launch pad if you talent and you're prepared to work hard. It's all about working hard."
The X Factor Live Shows start on Saturday night (October 6) and Walsh is mentoring the Groups this year.
X Factor finalists arrive at London Corinthia - photo gallery: