The contents of the Limited Edition are no different - all the same artwork, text and quality. The main corporeal difference is that it's hand-bound in leather. The real difference in price is because it's limited and numbered. Rarity automatically makes something more valuable.
If you're purely interested in the artwork, plump for the paperback. For a book lover such as myself, the Limited Edition was a must. Also, the Limited Edition is more sturdy and will survive longer.
I really wish they'd have released the Folio Edition.