I have both as well, you'll have a hard time getting my Protege!!!!!
I really enjoy 3.7 nice warm vapor, you can lay on the button if you want (and I do).
Has a really nice feel to it and battery life varies 5-8hrs for me.
I just got my V2, ain't digging it yet. But I have to say this, you cannot lay on this button. I bought a SS tip for it so I can drip. I am in the learning curve phase so take this with a grain of salt.
You will get a lot of vapor and one hell of a throat hit with the V2.
This is one thing I can say for sure with certainty.....I cannot vap the V2 the way I vap the Protege. If you want something to hit all the time (chain vap) I would get the Protege.
If you want something to hit every 5-10-20 minutes I would get the V2.
And with all that said, if you aren't strapped for money and can afford both that is what I would do.
JMO
Maintaining these units are key, I cannot stress that enough take care of the threads and keep her clean.