Whats the best way to get this fitting off

hack saw blade,,,work the inside as far as you can before threads, then tap the right side in so it breaks in, then use vice grip and turn the bent down tab to the left and itll either unscrew or peel the whats left of the pipe away from the threads. Ive had little success with internal pipe wrenches, good concept but the ones I bought at Home Depot were crap. Im sure an expensive one with hardened jaws would work better. The internal support is a great way to grab those thin wall tubes, worked for a diverter valve replacement I had to do through shower tile.