I would like to respectfully disagree here. The Yamato YF-21 was very far from perfect. IMO it was one of their worst ones. It only looked good in fighter mode and even then, it had flaws (like the feet showing at the back). The gerwalk was a hollow mess and the battroid had awful proportions and could barely stand out of the box.
Granted the Bandai is far from perfect either, but QC issues aside, I think overall it is a better toy despite the line art inaccuracies.