Both, depending on the situation/terrain/time of day etc. But graetly prefer spot and stock to any other method hands down.
I was in New Zealand a couple of times rounding up deer on horseback for the farmers down in the valley, the 'clean skins' that the helicopters had missed... and they had mountainsides just like yours WinMag, which the Kiwis called "hills". Hundreds and hundreds of non-stop slopes called 'hills'. I bet you don't often ride down those slopes of yours?
Spot & Stalk, That's pretty much bread and butter hunting down here in New Zealand. In the area your hunting , apart from thick bush, a smart hunter will walk for ten minutes and glass for twenty. An old hunter once told me that "For every deer you see, there was three you missed."