I think the vast majority in this forum will be against elastane, based on the talismanic aversion to synthetics. But any suit will at least have a synthetic lining. First, I would look at try both on, and see how it moves. Of course, the elastane/spandex/lycra will keep the suit from wrinkling, but at the same time I would think that the suit would wear less naturally. It might look too 'synthetic', like a lot of the stuff you'll get from Banana Republic. A harder question will be durability. Hopefully this is a suit that'll last for years. How will the elastane affect that? Can you send it to the dry-cleaners, will it hold up? Finally, comfort. Will it trap in more heat? Like George Bush, when I'm not exactly sure, I go with my gut. But I have a much more cautious gut. The safe route would be to take the wool one. The much safer route would be to skip the Armani. I'm extremely suspect of these designers, most of them are trying to hock low quality clothing for outrageous prices. But that's not always the case.