Tough question because both can be good. If you're truly in search of a large buck, my theory is to move in from the edge as some of the others have mentioned. Many times, it seems the big boys like to "stage" just inside the timber edge until dark. I like edges more for morning hunts during the pre-rut and even during full rut. Seems like there's more bucks running scrape lines at this time. If you are real serious about scent control, you might consider setting up somewhat downwind of a good scrape since the big ones will often wind check a scrape from a distance unless they decide to tend it on that particular occasion. I like to be set back about 10-15 yards from the edge and about 30 yds downwind if I'm trying to hone in on a trophy. I also like to be a minimum of 20 feet high with around 25 feet preferred. Just my .02 though.