In terms of software quality, which transition did Nintendo handle better, 3D or HD?

[Slownenberg]

Obviously 3D was infinitely better. I mean transitioning to 3D and HD aren't remotely comparable. Shift from 2D to 3D is a huge change and Nintendo absolutely nailed it, pretty much single handedly showing the entire industry how to do 3D games. N64's games simply blew everything else on the market away. While HD is just a matter of graphical fidelity increasing and so making assets and therefore games taking longer, but there is no gameplay shift from SD to HD.