They all have seemed to perform well at keeping me dry in a steady rain, although I have the least amount of experience with this in the Yukon's.
Other than just day hikes in the rain, the only multi day trip I've had with the Teton's is a 10 day hunt, well above tree line, on Kodiak in Oct. The Teton's performed great with breathability while hiking, and in some pretty heavy rains to boot, but there was absolutely zero brush on that hunt (which their not made for brush busting anyway), so that was not a factor. My son wore the Teton's exclusively on our sheep hunt last year and stayed dry throughout those 10 days. We didn't have tons of rain, but we experienced some, and we hiked between 90-100 miles on that trip, and also went through some pretty heavy, and wet, bushwhacking. He did get several small holes in the pants, on both legs, from the knees down though.
I've been using the same Chugach set now for about 6 years and they have performed flawlessly with everything I've put them through. I ended up picking up another new set for backups when my originals finely die.
As for the Yukon's, I can't really say, as I have only worn them once while whitetail hunting back east. I spent one day in them, in a tree stand, in an off and on, cold rain and had no issues. So far I just haven't felt the need to use the Yukon's much, although as I start to do my mountain hunts more and more, using only one pair of pants, I might start just wearing the Yukon pants more.