Oh lord, let's get this straight.

There are two main types of variable valve timing out there. One of them is a "cam phasing" system which makes use of adjustable cam gear(s) controlled by the ECU. The computer is able to vary the timing of the cams up to a certian degree. This can either be done with infinitely adjustable gear(s) or with just a couple of settings.

The other type is a "cam switching" system in which the motor is able to switch between different cam profiles. There are generally either two or three profiles. Now, the various options out there are basically a combination of one or both of these options, and either on one or both cam or on a single-cam motor. In a couple of instances, the systems are able to deactivate one intake valve per cylinder to save fuel. I'll call this "valve deactivation" on my guide. A thorough although by no means absolutely correct rundown:

Audi 3.0 V6 and V8 = DOHC. Continous intake cam phasing , 2-stage exhaust.
BMW VANOS = DOHC. 2-stage intake cam phasing.
BMW Dual VANOS = DOHC. Continuous intake and exhaust cam phasing
Ferrari 360 Modena = DOHC. 2-stage exhaust cam phasing.
Ford VCT = DOHC. 2-stage intake cam phasing.
Honda DOHC VTEC = DOHC. 2-stage intake and exhaust cam switching.
Honda SOHC VTEC = SOHC. 2-stage intake cam switching.
Honda SOHC VTEC-E = SOHC. 2-stage intake cam switching. Valve deactivation.
Honda 2-rocker DOHC i-VTEC = DOHC. Continous intake cam phasing. 2-stage intake cam switching.
Honda 3-rocker DOHC i-VTEC = DOHC. Continous intake cam phasing. 3-stage intake and exhuast cam switching.
Honda SOHC i-VTEC = SOHC. Continuous cam phasing. 2-stage intake lobe switching.
Jaguar AJ-V8 = DOHC. Continous intake cam phasing.
Mazda VVT = DOHC. Continous intake cam phasing.
Mercedes-Benz V6 and V8 = 2-stage intake cam phasing.
Mitsubishi MIVEC = DOHC. 3-stage intake and exhaust cam switching.
Mitsubishi MIVEC-MD = DOHC. 3-stage intake and exhaust cam switching. Valve deactivation.
Nissan VVT = Continuous intake cam phasing.
Nissan Neo-VVL = DOHC. 3-stage intake and exhaust cam switching.
Porsche VarioCam = 3-stage intake cam phasing.
Porsche VarioCam Plus = Continuous intake cam phasing. 2-stage intake cam switching.
Renault V6 = 2-stage intake cam phasing.
Subaru AVCS = 2-stage intake cam phasing.
Toyota VVT-i = DOHC. Continous intake cam phasing.
Toyota VVTL-i = DOHC. Continous intake cam-phasing on intake, 2-stage intake and exhaust cam switching.
Volvo = Continuous intake cam phasing.

BMW has a new system called Valvetronic which does away with cams. Instead the valves are pneumatically (or maybe hydraulically) actuated and their lift, duration and timing is all computer controlled. It's infinitely variable so much so that the motor no longer has a throttle body.

So yeah I didn't really pay attention to what you guys are arguing about, but this should probably settle any sort of comparisons that are being made.