Tho not addressed to me (sorry Z) let me throw some light. I have both, from the day of their launch, the Sophia is the best out of the three (yes, I have the Killer705 as well). It get's you the most satisfying VTF. And performs excellently everytime, with whatever juice levels in the tank, with whatever type/ratio of juice and with whatever build you have (I use microcoils & cotton tho).
The fact that you have a juice control on it tips it further on the scale vis-a-vis the Diver v2. What that means? Well, when you are not using it ~ just close the feed (I do so before going to bed, everyday) and thus come what may IT WILL NEVER LEAK. Isn't that splendid?
Now, the pros on Diver v2. Very similar vape (but not exactly the same as Sophia). Easy to use (you don't need to tinker anything, aka juice control) just put it in and vape. 35mm length (flush mounts with the top cap of your tank), some ppl like it that way, doesn't matter to me (I use a stubby driptip on the Sophia). AND: Least expensive of them all (might mean a lot to many)!
Hope that helped.