A deck mount pot filler and a wall mount faucet are two very different faucet types. You will need to make sure that you know the difference between them before you decide which one you should purchase.
Wall mount faucets are usually made for older homes and kitchens. They work the best when they are paired up with homes that have plumbing that will go all the way up behind the sink wall. They are more difficult to install but are sometimes necessary.
The deck mount pot filler faucet is one that is incredibly easy to install. You do not have to worry about tearing the wall out whenever you are putting one of these in. Unfortunately, these are not always an option for those that have plumbing that goes up and behind their wall. You will also find that they are more expensive than the wall mount faucet.
It comes down to what it is that your home requires. If your home will allow for a deck mount, it is the better faucet as it requires very little for installation. However, keep in mind that a deck mount faucet is generally more expensive.