Tornado PU tubes vs Zodiac PU tubes
The PU materials currently used by Tornado are improved versions of their original PU material, and have been used for several years with excellent feed-back on performance and durability.
All UK/European manufactures using PU, except Zodiac, use equivalent grade materials.
There are other PU materials on the market, used extensively in the USA.
The Zodiac PU material, as far as I'm aware, is of a different design, and might not be as good. If anyone has technical details I can comment in depth.
The view that Hypalon is better is contentious to say the least and there is much evidence to the contrary - see RIB International June/July 2007 for details. Not to say that Hypalon isn't very good of course. However, it is interesting that Zodiac are using PU for their largest RIBs.