Not sure what the proper terminology is for this, but while the Pro-Q has a sort of metal "frame" with a sort of metal mesh that it supports, this looks like sheet metal stamped with holes, sure there is a proper name for that. I think airflow would be better in the Pro-Q, but I dunno! Obviously the spiral pattern vs the inline pattern are another difference, I couldn't vouch for the effectiveness of either, but it sounds like Ian has tested both in production and probably has his reasons why he chose the spiral pattern. I do think the "starter ramp" with a slot for a candle is a clever feature of the pro-q model.
Unfortunately I can't find any hi-res pics of the "amazen" but here's one from their site. Looks very "stamped":
Contrast the construction and materials to the Pro-Q:
I think I'd still go for the Pro-Q, not that I'm not pleased to see evidence of further burgeoning interest in cold smoking. It just appears to be slightly better made, and has more track record at present of happy customers (myself included).
EDIT: Photo credit above to Don Marco from an early review he did...never hurts having DM photo your product, he has as much a gift with a camera as with grill tongs...