How do you say What is your favorite color in Chinese?

There are several ways:

ni zui xi huan de yan se shi shen me

你最喜欢的颜色是什么?

(Literally: your favorite color is what?)

ni zui xi huan de yan se shi na yi ge

你最喜欢的颜色是哪一个？

(Literally: your favorite color is which one?)

ni zui xi huan na yi ge yan se

你最喜欢哪一个颜色？

(Literally: you like which color most?)

ni xi huan na yi ge yan se

你喜欢哪一个颜色？
(Literally: you like which color?)