Yes you do notice a difference with 3 link, has near zero rear torque steer, a big thing at targa when negotiate high speed bumpy bends can really feel the rear move around it doesn't spit you out just feels bit uneasy.
The 3 link eliminates that, also allows the rear to squat under power, more weight transfer to rear, more traction.
Maybe just your use of terminology but I thought squatting was when the weight comes off the axle, such as the springs compress, you want anti squat where the rear suspension lifts the rear of the car, where the weight pushes down on your axle.