Henry and Warne, who were knocked out of Team Jessie on Sunday night's Voice results show, said that they had never considered competing on a TV talent series before The Voice.
"I never, ever considered going on The X Factor. The Voice is purely on talent and I love that concept. It's a show that works for me," Henry told Digital Spy.
"I spoke to some of the contestants that have been on The X Factor in the past like Vince and Joelle. They said that there's a lot more freedom here. With song choices they are open to opinions and options. They want our ideas."
Warne added: "I think the bottom line is that on The Voice there has been so much talent. The coaches have given constructive criticism when needed and have been positive when needed. You don't need to rip someone apart.
"All these coaches have been there and done it. They know about the stresses and being on the money in the moment. The comments on this show have been genuine and to the point. For me, it was the perfect mixture this show.
"I felt freedom, which is what you want as an artist. I felt Jessie would let me do what I want to do.
"The Voice has something special about it. There was no comedic element to it and it is called 'The Voice' - that's great."
Vince Kidd, Becky Hill, Bo Bruce, Max Milner, Leanne Mitchell, Ruth Brown, Tyler James and Jaz Ellington are the final eight contestants on The Voice, who will all be performing on this weekend's live semi-final.
Kylie Minogue and Cheryl Cole will be the special guests on Sunday night's results show.