Can only speak on OAB vs Classic vapbong at the moment as I already have experience with both, and find the variability in strength of draw and effects is greater with the classic than OAB. Aka more control to fine tune your experience and also increased ability to take the larger face melting clouds of vapor that the vapbong became famous for.
Not that you cant get a face melter with an OAB, but the constricted mouthpiece seems to make the draw more consistent and therefore less likely to give you a smack all at once. A hard pull from an OAB will give you a long consistent draw. Think trying to suck down a milkshake through a straw as fast as you can, not going to choke on it and only so much can enter at a time. The vapbong on the other hand has such a unique high airflow that the harder you pull the higher strength and output of vapor and without the increase in draw strength that we are used to with convection vaping. Now take the lid off that milkshake and try to drink as fast as you can by tipping cup back, you may find you cant drink at the same rate it is able to pour at. The vapbong is similar to this as even the most seasoned vape veterans have no issues getting this device to produce a strong enough draw to achieve the desired effect. This is the best real world example I can think of lol, hope it helps...
All that being said I currently have a berserker on the way and will report back when I have some experience with the device. I imagine it hits similarly to OAB as the mouthpieces are very similar on both devices and therefore I imagine draw & strength of pull would be similar. Hope this helps!
Definitely another masterpiece from Jaxels Art!
appreciate the support! 
