I have always done my rack deads with the bar just below my knee. Sometimes this is lots of fun since many power cages don't go that low so i have to but the box on top of plates ( i need to get an extra 5 inches or so at golds to get bar there)
Then I also see many people with the bar at mid knee or top of knee.
What is you preferred spot and why? How do you feel you benefit from the location you do it from vs the others?
I know I can get more weight if bar a bit higher but am I getting as much benefit as when bar just below knee