It's a toss up.
I have noticed that it depends on the individual.
Some are natural squatters and others are natural DL's.
BOTH require excellent form.
Injury-wise, that's a tough one....
I mean you are suppose to squat in a rack so IF you miss it, the potential for injury isn't that great.
I have seen some people really **** up their backs and shoulder on DL's.
I've also seen people hurt themselves on squats and BP too, overheads too.
Typically the injuries are more ego driven than exercise driven.
Psalms 144:1
Praise be my Lord my Rock,
He trains my hands for war, my fingers for battle !