Depends on whether you're going to ever need to remove "factory" barrels, or mess around with milsurps.
I've got two in the shop, one a heavy custom I machined from aluminum that I make bushings for, and the other the Grizzly/Viper style that doesn't require bushings.
Viper style, because the pre-contoured surfaces don't fit a barrel precisely have limited surface area contact and you can't put a lot of torque on a barrel before it spins.
Yeah, it'll usually handle the necessary 60 or so ft lbs- but most factory barrels are put on monkey-tight and you need a heavy duty vise with bushings machined (or epoxy bedded) to precisely fit the contour of the barrel shank (Try a Tikka T3...)
The Brownell's barrel vise, and wrench are heavy-duty ( I use the wrench), several common bushings are available, and you can use a bushing "blank" with Steel Bed epoxy to cast one to fit any contour.