Classic "Trout" vs. "Western"
The "Western" model, is the faster of the two. Think of the Western mod/fast graphite, which compares to a Loomis GL3 or a Rainshadow RX7. The trout model is more like fiberglass, not quite as slow, but on the more moderate side. If you want the modern fast blanks, these are not for you. If you want classic "slower" action, which seems to be the trend, then you will not be disappointed. (the western 5-weight is sold out)
For the record, I recommend non-fast and non-ultrafast for most people under normal fishing conditions, about 85-90% of the time. Not everyone agrees.
Hope this helps.