Depends on money. Mounts are mounts, and if the brackets size up, then you have something that works.
To spend the least your looking at a standard flat wall mount ( these suck in my opinion because changing out components is very difficult.
Next up on price is the tilt mount, it moves a bit so its easier to fiddle with new components, only problem here is unless you have a really high up place your putting it, the tilt has no effect on the general look of the picture(i.e. glare)
Most expensive is gonna be a swivel mount, these are by far the best if you have the money and the space, it allows complete mobility out of the product along with easy access to swapping of components and so forth.
Remember, the company (in your case vizio) will always "recommend" a mount... 9 times outa 10, they own the company that produces them, or work hand in hand. YOU DO NOT NEED TO BUY A "Vizio mount"