The Radio 1 DJ claimed that the ITV1 series had been damaged by The Voice UK, which aired earlier this year.
"On The Voice we had real musicians, teaching real musicians," he said today. “I still watch X Factor but this year it feels different.”
It's not the first time that Reggie has hit out at the rival series.
He previously took aim at The X Factor's sob stories, saying: “On another show, where someone’s father has nearly died and they’ve held the note, they’re good to go.
“But that’s not what ‘The Voice’ is about. Ours is far more credible than any other music competition show that I have seen.
“It’s about musical talent, not about how they’re dressed or how good they look.”
But X Factor host Dermot O'Leary has hit back.
He conceded that The Voice was a "good show", but reminded Reggie that The X Factor's live show ratings are still well above The Voice's, which dipped to 5 million viewers in the summer.
"I enjoyed The Voice and it's a good show," Dermot said. "But we're the biggest show in the country and we never take that for granted."
[cat c="the x factor"]The X Factor 2012[/cat] continues this Saturday night with a spooky Halloween themed episode as the remaining ten contestants perform live once again.
The latest results show follows on Sunday, which will feature performances from Fun. and Robbie Williams, as well as one more act being given the boot.