I have hunted sheep in Alaska for over 10 years. I use only single layer rain gear, I have found that triple layer type is very tiring to climb in and takes longer to dry. There are many manufacturers, I have used Kuiu Chugach since 2010 and have no reason to change or even replace the original set I bought. Single layer, with pit zips to help vent when climbing.
If cost is a factor, Helly Hansen Impertec is a good choice. Has some stretch to help when climbing.
Moisture management is difficult when sheep hunting, the temps tend to be cold, so you dress to be warm and then get sweaty while climbing. This gets even worst when wearing rain gear. Layers are critical and layers that hold body heat when damp are a necessity IMHO. Add hiking in the rain and through wet brush and staying dry is even harder to do. That is why I like rain gear that does not hold water, once I stop I put on dry baselayers, my puffy and shake out my Chugach Jacket and put it back on.
This last year I hiked wearing only a Patagonia wind shirt 4OZs, it does not get wet and breaks the wind. I hike in it and shake it out to remove sweat, lay it over my pack to dry and layer up for sitting and glassing and change back to move. This system has worked well for me allowing me to stay drier and warmer.