Both are the decent colleges. Nalanda College OF Engineering (NCE), Chandi is Affiliated to Aryabhatta Knowledge University, Patna and Darbhanga College of Engineering is also affiliated with the Aryabhata Knowledge University, Patna. The colleges helps the students to make them expert in analysis, synthesis and design of engineering systems, and provide exposure to the current engineering practices and cutting edge engineering research & technology.

You can also check the genuine reviews of the colleges with the given below links.

https://www.careers360.com/colleges/darbhanga-college-of-engineering-darbhanga

https://www.careers360.com/colleges/nalanda-college-of-engineering-chandi

Good Luck!