Not to mention the ability to make a few types of skills and items that wouldn't be available (without common events) with VX, and I'd have to assume XP. This, and classes will automatically swap out your skills for you, instead of forcing you to either add in a script, or code in your own level/class check common event, which although is not a pain in the ass to make, is still a let down for those who want to swap between classes.
Except Yanfly's VX scripts offers more diversity, note AOE Script, Better Scan System similar to SMT series, custom skill effects, etc.etc.etc. which you can use to emulate rm2k3 special attacks except better and wait till Project SRW hits out, sideview battle system can emulate Mana Khemia Movement. Also,
CTB, which is way better than ATB any day.
And VX resources are actually abundant right now, rpgmakervx.net, rmcollective, bunch of japanese sites some conveniently linked in that website.
Oh and self switches definitely. I cannot stress this enough.