The difference is that the more expensive deck is made with Bicycle brand cards, with the Bicycle back design. Some magicians prefer to use all Bicycle back cards for their tricks, so that their decks all look similar.
Also, with the $20 Cartoon Deck,if you want to repeat the trick, the second time the magician disappears.
The Magic Cartoon Deck is less expensive and is made with cards that have a custom back design. The Magic Cartoon Deck also comes with an exclusive bonus ONLINE VIDEO INSTRUCTION, with tips from Peter Monticup.
Both decks are quality made, and both operate exactly the same way.