Mountain Hardwear presently lists two major lines of mountaineering tents: the Trango series and the AC series. The primary difference seems to be that the Trangos feature a double-wall, are cheaper, and heavier, while the ACs feature a single-wall construction, are more expensive, and are lighter.
Is there more to it than this? What are the target consumers for each line, and what is the best use for each product? Does it really just boil down to a trade-off between price and weight? Are there significant performance differences aside from weight? For example, is one or the other thought to be considerably stronger in high wind, or more waterproof in very damp conditions?