Why use a T-Bar Row instead of a Cable Row ?

The issue with a Cable Row is it is too easy to load up the weight and lean back too far which just overloads your traps. You would be better in this position doing shrugs. When using the Cable Row sit up really straight and push your chest forward as you row.

The T-Bar when used properly keeping your chest on the pad, head down allows you to really hit the mid back with the inner handles and the rear delts and traps with the outer handles. The deep stretch also allows a full range of motion with the scapular which is great for posture