Why is a triangle worse than a square?

Question

3D

Why is it considered that, in simulation for games, a grid of four points is better than a grid of three?

Answer 1

Because on a grid of quads it is easier then to do smoothing to the final model.
Check out this video series for example. There, an example shows this (10:11) https://youtu.be/WxMwa0njGSM?t=10m11s

Answer 2

Vidyaha draws everything with triangles, a square is 2 triangles. Try to work with some kind of opengl or the like. graphics without frameworks and other things, you will see for yourself