Some years ago, after a suggestion here in forum, I compared both and I found VA a bit more natural sounding.
I used Melodyne for a long time time but when I started checking out VariAudio I found myself reaching out more often for VA till I completely forgot about melodyne.
That was because VA is also more convenient to use within a project.
But I am not happy about certain things.
The most significant is the volume handling of individual notes and group of notes. That is to say that there is none. You edit individual notes and when you select many of them and try to edit then you lose all the previous volume edits for the individuals.
Also no option to choose between “standard solo” and “elastique pro” for the variaudio editing.
I 've made some topics about these issues a year ago or so.