stay in home和stay at home有什么区别?呆在家里我常用“stay at home”,但是我一些地方看到“stay in home”的用法.

stay in home和stay at home有什么区别?呆在家里我常用“stay at home”,但是我一些地方看到“stay in home”的用法.
It's better than stay in home all day.总比整天呆在家里强。这句用“in”还是“at”好呢？