I believe Zavvi and The Hut are sister sites, so I typically check both for prices since they offer the same/similar items (although I recommend for future purchases, Zavvi typically has at least equal or cheaper prices).
As for newbies to either site, the biggest hurdle is availability and shipping speed. If you are in no hurry to receive your games (like me with my backlog), then it's no problem. You will receive your brand new game in perfect condtion, never had an issue.
But be ready to wait at least a week (or longer) even when in stock to get your game.