The singer - who placed sixth on the singing contest last year - argued that the fact you can play a guitar during your audition shows the show has grown.
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"A lot of it has changed as well. You can go on there with an instrument," Henderson told BBC Newsbeat. "You can play and there's just a lot more artistry to the show and that's great."
She added: "We've got somebody like James Arthur, who won and he's an incredible talent.
"Everybody was so different this year and so diverse and I think it just shows the show is a credible show at the end of the day and that people have come off it who really do take music seriously."
Henderson recently signed a record deal with Simon Cowell's Syco record label and will work with Emeli Sandé on a song for her debut album later this year.
Photo gallery - The X Factor Tour 2013:
