Panjab University’s main campus only offers B.Sc(Hons). Admission is through PU-CET. The UG seats are also limited. For admission, you can fill the form online, by visiting the admission portal of the university. 

DAV College is affiliated with Panjab University. Both B.Sc (Hons) and general (PCM) are available. Admission is based on merit as for which will be better, choose the institute based on your preference.