As I understand it the squat works all the extra balancing muscles that leg press does not generally get.
I stopped doing squats because I find that my shoulders/back are not strong enough to support the weight and I feel like I am doing damage to my back. So I started working the back better and moved over to hack squat.
My question is wheter the hack Squat targets the muscles any differently than the leg press?
Leg Press : 6x610lbs
Hack Squat : 6x500lbs
Squat : 9x265lbs (can do more but worried about back as above)