Don't think there is one right answer to this. I rarely drive in where I hunt, but my Dad and I used to hunt some very mountainous woods in north Alabama and driving in was a must. My dad wasn't able to walk the incline and if I did, I would have such a sweat going that my scent would have been much more likely to scare the deer.
Now, having said that, my dad killed numerous deer on that mountain by driving in, hiding the 4-wheeler in the edge of the cutover and climbing in his ladder stand not 50yds away. If any deer heard the atv, it didn't keep many of them away for long.
Also, think how many times you have driven by deer on the side of the road in your truck that barely raised their heads as you drove by. Now if you stop and roll down the window, they speed away.
I don't know which is best, but just something to think about.