Low power allows you to pick up your target faster. Better for close range. Also allows you to shoot with both eyes open. Faster target acquisition. Red dot type "scopes" are great if you don't need magnification.
I used to think scopes were overrated, but then my brother in law and I got into a group of mulies as the light was failing -- he had a scope on his rifle and I didn't. He got his deer, but I couldn't see the front blade reliably enough to take the shot. I've been a scope hunter ever since.
Of course, after a few years of that mentality I hunted whitetails in the woods of Alabama. My son and I jumped three whitetail that exploded out of the brush to our right and bounded off to our left just a few yards away. I snapped my rifle up, but all I saw was tree branches.
There's no solution that works every time. Sometimes you need both.
When it comes to scent, there are basically two types; those that attract and those that mask. I've tried both on many occasions. There are lots and lots of "doe in heat" scents, designed to attract a big buck into range. I've also used a "cow in heat" scent while elk hunting.
Another scent would almost be better named as a "coverup smell". The main goal is to cover up human odor or mask it. Though I don't believe you can ever totally eliminate all human...