I do not have all three, so I won't vote, but hopefully my comment will still be helpful.
I have only tried the Ina among these three. I'm not sure if you've read my review
, but I was severely disappointed. My biggest problem with it was the fact that you couldn't control the clit portion separately from the internal portion, so if I wanted soft clit vibrations and strong internal vibrations, I was just out of luck. I believe the Soraya has the same issue. That may or may not be a problem for you, but it broke my heart.
In addition to that, Ina is not waterproof, but the other two options you've got are.
Finally, make sure the one you choose is a good fit for you body: measure up!
But my suggestion would definitely be for the Vr12, because the levels of vibration can be customized.