The Christ University Delhi Campus started off this year. The Bangalore campus has been there for long. So comparing both would be a bit unfair.
Many buildings are still being constructed in the Delhi Campus, while the Bangalore Campus ( which undergoes minor tweaks every year ) has a solid infrastructure with years of building.
Choose the right campus depending on the course you prefer. ( I heard the campuses differ in the programs it offers). Also if your hometown is near to either of them, choose the closest one.
Currently, the Bangalore Campus has a higher number of students and will have a more diverse crowd. But it will surely change soon, once the Delhi Campus is fully functional.