Pattaya is actually a very good place to do an Open Water course. As new divers are more focused on themselves, their skills and getting things right, perfect conditions are not at the top of the priority list. As I'm sure Arizona would agree, the sites in Pattaya are not terribly challenging and more ideal for new divers than experienced ones. Once certified then, for sure, take off around Thailand and elsewhere and see what other places have to offer. But, unless you're on a liveaboard, the sites OW divers will be doing in Phuket will not be terribly different from what Pattaya has to offer.
Also, tell your friend that we can offer a 10% discount if he mentions your Scubaboard ID when booking with us at AquanautsDive.com