The rack deadlift is great for lifters with less range of motion, but can also be used to work the top range of the deadlift with a heavier load.
Typically, the rack deadlift is set up with the bar just below the knees, but just above the knee is fine too. If you don't have a rack, use a few 45 pound Olympic plates to elevate the bar into position.
High intensity vs. volume training. Olympic lifting vs. powerlifting. High intensity cardio vs. low intensity cardio. The list of debates and disputes in this field goes on and on, and perhaps the most disputed area is abdominal training.