Can I write who said it best alone. For an example- play j Cole's song ATM and write in status like "money makes people crazy, J Cole said it best" Is that correct sentence?
Yes, you can, as for example the "Who wore it best?" meme in celebrity fashion.
However, a more strict grammarian would say this is incorrect. If comparing two things, you should instead ask:
Who said it better?
(Edit) In your example, since you only list one item, there's no suggestion how many other items you want to compare it to. So "Who said it best" is probably better.