I can’t find the settings in Melodyne that I need. It seems to plane for me. So I consider of buying a complete tool. Who is the best of these two? Antares Auto-tune and Melodyne.

What exactly are you trying to do and what seems to be missing?

They both work great. I think it's more about your workflow and what you want to accomplish. Check this out:http://www.soundonsound.com/sos/mar07/articles/at5vsmelodyne.htm. It's an old article but it covers the differences between them.
 
Rocky
 
 

Melodyne has ARA in Sonar, Autotune doesn't. Important difference not covered there. Melodyne Editor also has support for polyphonic pitch control, huge difference and not covered there. I'm sure Autotune has some significant feature improvements as well.

The question remains "what do you want to accomplish and what seems to be missing?"

Well, I can't sing. And was recording vocal by me this week and tried the melodyne for the first time. And couldn't find what really matters. Things like voice shape after correcting. You get a lower sound when you tune the note down. And you need to make it lighter. Another thing is splitting a note. I really need that. Others is some easy auto that's works. The melodyne don't go 100%. I would have that option to make effects. That's all I can think of at the moment.

Take it from someone who also can't sing. Melodyne or AutoTune or v-vocal will not make a Pavorati out of a Neil Young. Start with practicing the vocal part until it's as near perfect as it can be and then tweak a note no more than a whole step (I prefer 1/2 step). if I have to tweak more than a half step I go back and sung it over unless it is a vocal that is not to be a lead vocal.

Ok, well from that description I would say you're looking for the note splitting tool and the formant tool. Although if you need the latter, you're using pretty heavy pitch correction and it's gonna sound a little artificial anyway.
You're right, those are functions of Melodyne Editor. If you recently bought Sonar you can write to Celemony and ask for an upgrade deal, most of us here have paid 150 for the upgrade, which is a lot less than retail (or what you'd pay for Autotune, never mind iLok hassles).

I don't have much experience with Autotune honestly. I think it's better than Melodyne at full on "auto" correction but you need to sing really well for that to work convincingly. In most cases I think you'd end up wanting to tweak notes anyway and then you might as well stick with Melodyne because of ARA. Melodyne's auto correct places the center pitch of each blob 100 percent in the center of the closest note, but if there is a lot of drift inside the note that won't change. With Editor, you can correct drift.

Also, if you have an older version of Sonar Studio or Producer installed, you should have V-Vocal. Most folks feel it has been superseded by Melodyne but it does have some features that aren't included in Melodyne Essential.

I don't mean to sound discouraging, but neither option is going to help you if you really "can't sing". So I hope you were exaggerating a bit :)

Yeah I was. But this is also for future works.
Thank you. I will pay for the upgrade. Saw a way to do that in app, under help.

Make sure you get the discounted price in that case!

I just used Melodyne today after a long hiatus from it. I'd forgotten half the shortcuts, and forgotten that it has trouble with tempo changes. But after a few minutes I was back in the swing of it and marveling all over again at how good it is. Having all the tools right there in a right-click menu makes it very fast and easy, even when editing four parts at once as I was doing this morning.
 
I've never used Autotune myself, but I've watched others do so and it didn't seem to be as fast or intuitive as Melodyne. Probably comes down to what you've gotten used to, and I've been using Melodyne for about eight years so it feels pretty natural, even after being away for awhile.
 
And then of course, there's the iLok consideration.