What is VGChartz "estimate" ? And how do we know that either are a close enough estimate ? Could go in all sorts of ways ...
Scenario #1: Switch has already passed the Vita and it's overtracked
Scenario #2: The Switch is overtracked and it will pass the Vita later on
Scenario #3: Both are overtracked and it's undetermined which is ahead
Why are you on this site if you're going to object to the estimates?
Well, the numbers on the site aren't infallible, and in fact when the numbers were more up-to-date complaining about their accuracy was the favourite pastime of the site!