Rex, like you, I' too happen to prefer V-Vocal. I've been using Melodyne for years too and think it's an amazing program. But V-Vocal works fine for me and I can dance around in it so easy, I would be lost without it.
That said, for very difficult jobs or for people that really need help, Melodyne wins without question. And trust me, I come from the same camp as you and have V-Vocal installed from an old version of Sonar just so I can still use it.
Here's the other thing to consider....your source. Though I don't consider myself any kind of good singer, I have very good pitch and sing better than the average hack. That means a guy like me will not need much by way of a vocal pitch correction product. So I in my opinion, the uses for Melodyne and V-Vocal will depend on who your "subject" is. :)
The Melodyne editor is sickness and it should be mandatory that everyone has it "just because." It's a really powerful piece of software. BUT....it and the learning curve that comes with it is not for everyone.
That said, my advice to you would be...if you have uninstalled older versions of Sonar and you have purchased X3 which no longer has V-Vocal in it, just install V-Vocal from one of the older versions of Sonar and it will work perfectly in X3. Whether Melodyne is better or not wouldn't really matter to me if I were you. What matters is you having what you want as well as what works for you. I use a lot of stuff over here that would make people laugh at me. When something works for me and I get great results, it doesn't matter what anyone else thinks. Use what works for you and stick to your guns.
Sometimes we are set in our ways and happy with what we have or what we know even though it may be primitive or not quite with the times. I don't think there is a fault with that because we really can't put a price on happiness or ease of use. AND, if something simple does the trick while saving you time, or a big learning curve so be it, ya know?
I had a guy try to sell me a Behringer X32 console tonight because he thought it would make things simpler and save me money. I elected to purchase a console that was the price of a small cottage instead. Was it a bit overkill? Definitely...but it was what *I* wanted and MY happiness is what's important....as long as it doesn't hurt anyone of course. :) Good luck.
-Danny