Which is better – the Ka’bah or the grave of the Prophet (peace and blessings of Allaah be upon him)?

In the answer to question
no. 97384 we have explained that many scholars regard the Prophet
(peace and blessings of Allaah be upon him) as the best of creation, and in
their discussion they also said that he is better than the Ka’bah.  

This preference applies
only to the Prophet (peace and blessings of Allaah be upon him)
himself, not to the grave in which he is buried. 

Shaykh al-Islam (may Allaah
have mercy on him) was asked about two men who were disputing. One of them
said that the soil of the grave of Muhammad (peace and blessings of
Allaah be upon him) is better than the heavens and the earth. The other
said: The Ka’bah is better. Who is right? 

He replied: Praise be to
Allaah. As for Muhammad (peace and blessings of Allaah be upon him)
himself, Allaah has not created anything nobler than him. As for the soil
(of the grave), it is not better than the Ka’bah, the sacred House, rather
the Ka’bah is better than it, and none of the scholars suggested that the
soil of the grave is better than the Ka’bah apart from al-Qaadi ‘Iyaad. No
one said that before him and no one else agreed with him afterwards. And
Allaah knows best.  

Al-Fataawa al-Kubra
(4/411) and Majmoo’ al-Fataawa (27/38). 

And Allaah knows best.