What is the suggested pattern on paper to learn handwriting?
On the web, I've found many kind of paper, such as those named 九宫格 jiǔgōnggé, 米字格 mǐzìgé, 田字格 tiánzìgé, etc.
I've got a book of chinese characters in which some characters are displayed on a 九宫格 jiǔgōnggé pattern while other characters are on a 米字格 mǐzìgé pattern.
I wonder which one should be preferred (if any), or if different characters suit better on certain patterns. Which paper is used by children at school, for example?