I'm fairly sure no potential employer will have strong feelings on what format you show your work. Although from personal experience, if you just load up your website, (we have probably already been through that), what's new to present?
So what options are there? Well, you could show a PDF on your iPad or laptop. Then there is the good old fashioned portfolio with plastic selves and printed sheets. I still quite like that method as I can get up close and interact with it rather than sit through a glorified slide show.