Polyair Bellows Vs Airbagman(Firestone)

G'day,
Trying to decide which make to go with. I was pretty sure the Air bag Man version was the go. All the posts I found here suggest that they are the prefered option. The TJM bloke who installed my rollerdraws even suggested to steer clear of the Polyair version and had the Firestones on his own vehicle. He said he'd had problems with valves popping out of them?? I spoke to the Air Bag Man and of course he says they're the best! I think he said the Polyairs don't have internal bump stops and arn't as thick. He also said I wouldn't need my weight distribution hitch anymore either, even after me explaining that no matter how good his bags are I'm uncertain they can defy basic physics. And this guys advising people every day on this sort of thing-crazy.

Then I talk to suspension bloke who I trust and he reckons there's nothing wrong with the Polyairs. I'm getting the same guy to redo my springs and put some new bushes in and would be simpler to get him to do the bags as well. Although I'm realising as I'm typing this that I'm sure he'd fit the Firestones for me if I wanted.

So thought I'd put it to the crowd. Sorry for long post.

Cheers
Matt