What is the difference in reward between Hajj and Umrah? And thank you.

The best way for a servant to draw near to Allah is by performing the obligatory duties, as the Prophet, peace and blessings be upon him, said: "My servant does not draw near to Me with anything more beloved to Me than what I have enjoined upon him." Supererogatory acts complete any deficiency in the obligatory duties. Therefore, the reward for the obligatory Hajj is better than the reward for Umrah, even if it is not obligatory.