Da Torch is the more powerful illuminator. If you're hunting predators at night, it's tough to beat. Adjustable windage and elevation and a very strong light, and adjustable beam width mean it's ideal for a longer range illuminator if you can't get a laser-based IR illuminator.
The Vampire lights are well suited for short to medium range applications. I think the vampire light's IR mode is pretty effective out to 150-200 yards. Not as far as Da Torch, but well suited to CQB ops. Of course, the real selling point of the light is the ability to have both IR and white light in the same light, of course. Like any "Jack of all trades" it is a master of none. It's not the best white light, and not the best IR light, but it's very good at both and all in one package.
If I were hunting, I'd probably prefer Da Torch. On my defensive guns, I mount the Vampire lights (the M952V in a Danger Close mount for me).