I have small hands and am petite (arm length).
Will the neck on the Dean be suitable? or should I watch for a smaller neck/width?
The size of the Vendetta's neck and fretboard are smaller than the most stuff you'll find from Gibson/Epiphone, Fender/Squier.
Someone can correct me if I'm wrong but I think the Wizard necks on Ibanez guitars are the only ones out there that would be smaller.
Try and hit a local Guitar Center if possible. They should have some used ones you can at least hold. Who cares if you know how to play. Just rest the neck in your hand and wrap your fingers around it. Then try the same with another model and you should be able to notice the difference.
I found the Vendetta easier to play when I first started. But as I got into playing more chords, it got harder to use only because I had a harder time cramming my fingers into the smaller space. Eventually gravitated back to the guitars with larger necks/wider fretboards