I have been a student of Guru Nanak Dev Engineering College (GNDEC) since 2011, so I guess, I am the right person to answer this question. In my opinion, the features on which comparison can be done are enumerated as follows.
Autonomy
See there is a difference between University and college, especially on autonomy front. Though GNDEC had achieved the status of an autonomous college within PTU (Punjab Technical University) in 2012 whilst Chitkara is a fully autonomous university.
Technical Specialization
GNDEC is a renowned college in the region especially in the field of technical education. In GNDEC, only tech-oriented courses are available like mechanical to Computer science under Under Graduate courses. Only two of the Post Graduate courses cover non-technical subjects like MBA and MCA. Whereas Chitkara itself a university offered numerous courses on Technical to non-technical subjects from Under Graduate to Post Graduate level. Obviously more courses mean more diversity.