Imo it really depends on what kind of design you are specialized, how experienced/established you are and what you are looking for. Thus said a PDF would always make sense if you are job hunting. A lot of agencies, recruiters etc. like to scan trough your work quickly and check if you suit them or send it around (in a recruiter case for example). Also try to keep your portfolio a little more compact. Show the work you are most proud of or fit the company you are going for.
Imo it really depends on what kind of design you are specialized, how experienced/established you are and what you are looking for. Thus said a PDF would always make sense if you are job hunting. A lot of agencies, recruiters etc. like to scan trough your work quickly and check if you suit them or send it around (in a recruiter case for example). Also try to keep your portfolio a little more compact. Show the work you are most proud of or fit the company you are going for.