Louis Walsh was slightly more diplomatic when asked for his thoughts about rival ITV show The Voice.
Sharon Osbourne isn't impressed by The Voice, labelling it a "gimmick with twisty chairs".
The talent show sees famous faces judging singing hopefuls solely on their voices, before spinning their chair around if they want the singer on their team. It broadcasts on ITV, the same network as The X Factor, on which rock matriarch Sharon is a judge, but she's not worried about competition between the two programmes.
"The Voice is a gimmick with the twisty chairs. I love the judges and if I was asked to do it and didn’t have The X Factor, course I’d do it," Sharon said during an interview with the Radio Times magazine.
"But you cannot judge talent on voice alone, because if Mick Jagger was up there nobody would turn around."
Sharon, who knows a fair bit about on-stage charisma, added that musical stars have to have something else - an X factor - if they want to make it in the industry.
"It’s not just about the voice," she mused. "They have all these toads up there, and I’m sorry, half of them are backing singers. That’s why no stars have come from the show."
Sharon was interviewed alongside fellow X Factor judge Louis Walsh for the publication, with the Irish star slightly more diplomatic when asked for his views on The Voice.
"The panel on The Voice UK are good – I’m a big fan of Tom Jones, but The X Factor is a much better show," he said.
Sharon and Louis will be returning to the panel alongside music mogul Simon Cowell and former Pussycat Dolls star Nicole Scherzinger when The X Factor returns to screens next weekend.
And asked about who the best judge on the panel is, Louis said: "Simon’s the king – and queen – of the whole thing, definitely."
"You can’t top Simon Cowell," Sharon added.