Vitas are apparently softer and hence more suited to park/freestyle than the Cartels
They're like a "super park" binding, and have tech that allows you to run your binding a little looser than usual. This year's straps are also more cushiony in comparison to the Cartel's react strap.
You'll be fine on either, really. It's preference.
Nico Muller runs Vitas, and if they're good enough for him, they're probably good enough for you. Same thing with the Union Contact Pro, if they're good enough for Gigi, they're good enough for you.