The quartet said they are fans of District3 and Union J but warned they will need to "find their own lane" if they want longevity after the series.
Watch JLS discussing this year's X Factor below:
Aston Merrygold told Digital Spy: "Those two boybands are going to have to come out with something extremely different from what's in the market now.
"You've got the likes of us, The Wanted, 1D... Lawson. You've got a total mix and it's going to be hard to find your own lane."
He added: "They're going to have to try and come out with something different. That show does bring out the best in UK talent, you can't deny that."
JLS recently admitted that they want their new album Evolution to top the charts. The LP is released on November 5.
Listen to a sampler of Evolution below: