ALWAYS DO FULL SQUATS
Partial squats are never good. They neglect the hips and hamstrings. When an athlete stops above parallel his knee joints are forced to halt the downward momentum.
But once the athlete goes below parallel that stress is transferred to the more powerful groups in the hips, hamstrings and adductors.
Full squats keep all these muscle groups proportionately strong.
Bill Starr Strength Coach Johns Hopkins University Sept. 1997