Holloway told The Guardian: "The Voice is a good show and has had a fantastic amount of success in America. BBC One have kept their cards close to their chest [over the format].
"They've got some very good judges - some household names who have been very good on The X Factor before."
Though questioning its entertainment value, he claimed: "It's a very repetitive format, so we'll have to see how people hook into that. The auditions shows are somewhat more fascinating than the live shows."
Holloway nonetheless admitted of the head-to-head rivalry: "There's no question about it, it's stiff competition for us. We will have to see. I wouldn't say I'm super-confident but I'm confident."
"Optimistic" about an initial victory, he added: "The advantage we have is, our show has far more variety, and Ant and Dec. I would like to think that we're a good million or a couple of million more than The Voice."
Britain's Got Talent airs at 8pm on ITV1, while The Voice launches at 7pm on BBC One.