November/December is a good time anywhere on the river. Things might be a little slower and more difficult with the recent cold snap and big snowfall we had, but that should be over and melted (maybe) by next weekend. If you want numbers, the upper river has more fish although there will be more hatchery fish present and the fish will be darker having been in the river longer. Down low there will be fresh fish still coming in for a couple months but there will be less of them. On the plus side those lower river fish will mostly be wild and there will be a number of big Idaho B run fish spending the winter on the lower stretches. I think either trip would be productive and you'll find fish anywhere you go on the 100 miles of river, plus the crowds are gone.
"Perhaps fishing is, for me, only an excuse to be near rivers." - Roderick Haig-Brown