Upperback and forearms fatigue
Goblet Squats
All type of Squat (Back Squats, Front Squats, Goblet "Front" Squats, etc) in which the weight place at the top of the body on the back (Back Squat) or upper chest area (Front Squat or Goblet Squat) increases the loading on the core.
The Benefit
The benefit of Squats performed in this manner is the core (back and abdominal area) is worked and strengthened.
The Downside
The downside of performing Squat with the weight carried on the back or upper chest area is as q.Hung stated is...
Upper Back Fatigue
The limiting factor with Back Squats, Front Squats, Goblet Squat is the lower back fatigues long before the legs are completely overload and trained.
This was addressed in...
Barbell Belt Squats, Post 3
I have a few buck to spare. I heard a lot of good things about the belt squat machine. Well, I cannot afford a machine - butt I can afford the belt. Had anyone do belt squat that way (hang weight under the belt and squat on chairs)? Is it worth the time and effort? And how heavy you usually go...
www.strongfirst.com
I was looking for something to get some squat work in without having to double up!
In retrospect, would zercher squats/Deadlifts be a good option?
Leg Work
If your training objective is to develop strength in the legs, Zercher Squat are a good option.
Training Objective
1) Core Development
If your objective is to develop more core strength, Squats in which the weight/bar is carried higher is the key: Back Squat, Front Squat, Goblet Squat, etc.
2) Leg Development
If your objective is to maximize strength and/or size in the legs, the loading on the lower back need to be minimize or eliminate the back/core.