Pad Chief
You're 'supposed' to have greater power.
But then that's decided by your Espada rank really, people are going to pay attention to that.
Perhaps it would be good to award Vasto Lorde with something. There really isn't a good reason to be one.
I'm tempted to say Vasto Lorde should get Segunda Etapa but I find that silly myself and so I will say it, but I don't believe they should. Perhaps Vasto Lorde could earn the privilege of being able to use Gran Rey Cero among other powerful Hollow techniques without having to become an Espada.
Or maybe they could be allowed to develop more custom Hollow techniques.
It really is worthless being a Vasto Lorde.
EDIT: Unless the Vasto Lorde are very secretive about the benefits they have.
I play two Arrancar Vasto Lorde, and when working together they could probably take down Aizen without either of them releasing or breaking a sweat, since I designed them purposely to work together. One single godly-strong extra ability (or the ability to learn a single technique early/without Espada membership) would be a big plus, but I think I've already given that to my characters, with Danubi's truly-instantaneous movement and Maguda's basically perfect defense and Gemelos Sonido.
Sorry for not posting a lot in this thread. Real life's being a b*tch.
Suggestion: Why don't we create a set of moves that each class of Hollow can learn once Arrancarized, each set unique to that class of Hollow? For example, Gillians could do what the first two Arrancars from Las Noches (the one with the wings and the other with the weird tongue) did and exchange human forms for greater power, et cetera. But only those of that class could do that (so Adjucha couldn't exchange humanoid forms for greater power, or get any benefit outside of their Hollow class prior to Arrancarization).
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