I assume that's the Ultimate Wash and Wax. I haven't used it, but the primary difference is Ultimate contains wax, Gold Class doesn't.
I have used Gold Class. It contains paint conditioners which helps single stage paint with no clear coat that is sitting outside and is dry. It is also the only car wash I can find that isn't the cheapest of the cheap that doesn't contain wax.
It's a fine car wash, but probably so are the others. I think the only main deciding factors are price, concentrate dilution, and intent (with wax or no wax).