Whether you should choose Lucknow University or National Postgraduate College, depends on your priorities. 

If you only want to focus on your studies then you can opt for National PG College. But if you want to do your studies as well as a part-time job or want to pursue some professional courses like C.A, C.S, then you should go for Lucknow University. 

At National PG college you will need to have at least 75% attendance. Whereas, LU doesn’t have such attendance rule. You can easily give your papers. 

Some of the advantages of joining National PG college are that it is disciplined, the faculties are great, and they follow their own syllabus. While LU offers a huge campus, it also offers more subject combinations for its courses. 

Both institutes have their advantages and disadvantages, so choose according to your convenience.