Hi, first let me ask you to please post in the appropriate forum. This question has nothing to do with Forum News, FAQ , etc., but is clearly a DJ Gear question.
Vestax is gone, no support, drivers and firmware upgrades hard or impossible to find. Unless you really want to dig and are able to fix stuff yourself, this controller is not recommended anymore.
That leaves you with two different controllers for two different kinds of software. The S4 is only recommended with Traktor, the NV only with Serato (although I hear something about VDJ supporting the NV, not sure if and how well that works though).
And as always, the question of which software is best for you comes first, THEN the question of what hardware to pair it with.
I suggest you read up on some recent posts on the topic of selecting DJ software and the process of picking hardware to get a clearer picture of the homework you can do to end up with the best possible solution for YOU. You are the only one that can make that decision, nobody else can make it for you.