For rifle hunting yes your southern faces will generally have less snow so feed is more accessible than the colder north, northeast & northwest faces where snows can stay deep & make feeding a hassle & generally relocate elk & depending on the depths it can drive them to lower elevations.
For archery elk hunting we seek out any face that has abundant older growth timber whether it's pines, firs, aspens or a combination of these that can provide the needed shade & all around cooler environment. The more desirable spots will have feed & water nearby to these bedding areas.
I know for myself I do not discount any area or face, I've found elk on every face at one time or another. I will say finding them in their bedding areas no matter where that may be has led to much of our success. Once they are there you have a captive audience & elk are much more apt to approach your calls etc.! I let my bugle do my locating & then hunt them from there! -- In a nutshell you are on the right track in your research, find those bedding areas!
ElkNut/Paul