If you're looking to focus more on the quads, an upright torso position is best.
Taking a longer stride (with a vertical tibia) is more hip-oriented version; taking a shorter stride with a slightly angled tibia is a more knee (quad) oriented version.
So, if you're really trying to hammer the quads, you'd combine an upright torso with a slightly reduced stance length that creates a tibia angle similar to one involved in a standard squat.
Whether your goal is to build an amazing physique, a record deadlift, or simply put slabs of muscle on your lower back, try out a few of these exercises.
Need to shock your muscles into new growth? Need to make that personal trainer with the oversized head and youth-sized Under Armour shirt drop his favorite baby blue dumbbell on his toe? Then this killer workout is for you.