I have about 4 deck clips, and now recently purchased the Mint Deck Wallet. I personally believe they have different purposes, so it is hard to directly compare them. I use the deck clips for straightening my practice and casual performance decks of cards as their main function. Occasionally I bring my decks around in a deck clip, but not always.
With the Deck Wallet, it is something I will always be carrying around with me now. I keep my current casual performing deck in it, as well as my 3 card Color Monte in the back pocket, and a credit card.
The Deck Wallet keeps my deck of cards & tuck case completely safe from getting crushed, bent, torn, damp, etc. It is always crafted with care out of beautiful material. Leave the house with your Mint Deck Wallet and Keys, and that's all you need in your pockets.
Just love it.