Well, you have VV already. Limited, but VV.
I can only speak from my experience...I never had a twist. I used 808s for a weekend, kgos for two weeks, a vtube for two weeks, and now a provari for five weeks and don't see myself moving other than trying out the zmax. You have to decide two things. Are you in it for the long haul? Can you afford a little more?
I wish I skipped the vtube. Not for what it is, it is great...but only because I moved on so fast. The vmax or zmax might be worth you doing some reading on. Or, if you are looking at $80 for a lambo...maybe it is worth it to you to look at a provari.
It just seems from your post you are in the early research stage. My advice is not to jump so fast like I did.