VX's editor and default battle system are closest to 2k's, from what I've seen of them; XP's were stripped down quite a bit, possibly because they didn't think people would need as much built-in functionality.
really, though, you're best off just trying them both firsthand. you probably already know this, but XP and VX both have a thirty-day free trial available for you to get your bearings in each. just go with whichever seems the most intuitive or enjoyable for you! I'm a VX man myself, but they both have their merits and their weak points.
and yeah, welcome! good luck with all that game making stuff.