Oh c'mon, let's get serious. Look at the opening moments of the video. Look closely at the sensitivity setting of the Exp. II: the cursor is going around the #, meaning the guy was in auto mode! By doing that, he'll cut his depth. Also notice the placement of the coil is where the "line" is sideways. Ie.: the machine is lying on its side. And as you know, the Exp. II detects in a double-D fashion, so I'm not sure if the guy's targets were going across in the way you'd be sweeping in the field.
And when it comes to the seeming 2x-the-amount-of depth on the Vaquero, well LOTS of machines can be made in air test to do dazzling things like that. For example: you could have done such an air test with a Fisher 1266, to show astounding depths to knock-the-pants off that Exp. II. HOWEVER, in the field will be an entirely different matter. You would soon learn that the depth is only replicated in clean white sand. The moment you add any minerals and moisture, kiss that depth goodbye. And kiss target ID beyond the first 6" goodbye, etc..... So too might it be with that Vaquero: Great in an air test, but how good will it be in the field, in actual field conditions? What if someone needs good TID's ? (typical of turf hunters angling for deep silver)