Yamato will be the winners, no questions asked.
Bandai's are reissues of the old toys from the original release of the show. While good for their day, and the most playable of the 3 main ones, they aren't exactly known for their accuracy.
Toynami has had major quality control issues, as well as being Robotech merchandise, which earns them some more ire.
Yamato, despite a few quality control problems here and there, has consistently offered the most detailed, articulated, and accurate toys.