The PCH is a very scenic reasonably safe place to tour. The road conditions vary. I have only ridden a small part of it, but have driven a lot of it. It is really pretty close to ideal touring. For more details get the book:
Bicycling the Pacific Coast by Tom KirKendall and Vicky Spring
I rode the Colorado to Yellowstone section going the other way as part of our Cross country trip on the TA. That section of the TransAmerica would be a godd choice if that is where you want to ride. Colorado from Pueblo to Walden will be pretty nice. Wyoming to the Tetons is desolate but we enjoyed it.
The Tetons were quite pretty and I liked Yellowstone. Traffic was pretty heavy in Yellowstone, but doable. Try to avoid the weekends until late Sunday when the park kind of empties out.
Check out our journal and other Trans America journals on CGOAB for more details about this area.http://www.crazyguyonabike.com/doc/staehling2007
Given the choice between those two I would probably pick the PCH. Or perhaps a loop in the Colorado Rockies, I loved the Rockies.
This message was edited by staehpj1 on 8-29-08 @ 2:17 PM