Rows are a bitch to discuss, only because there are so many different kids, and people all call them different things. When you say T-bar, my initial thought is a machine that you almost lay on, and you grab the handles palms facing down, then row up to your chest.
personally I like rows like these
LINK the page calls them T-bar rows, but thats not what they are. I like standing rows like this for pushing through sticking points. you can use your whole body, unlike when you isolate with machines, which means more wieght.
Which type have you been doing? Its hard to explain sometimes, and if what i wrote doesnt make sense let me know.