Present only work you’re proud of, you shouldn’t feel the need to make any excuses for the pieces you present. Limit your work (somewhere around 8-15 projects is ok).
Think about your audience, tailor the portfolio by including work you know they’ll be interested in. Show yourself in your portfolio, your passion projects often are the most interesting things in your portfolio.
These projects let your interviewer get a glimpse of who you are, what you’re passionate about, and what you do in your free time. Because let’s face it you spend a lot of time with your coworkers, you’ll need to get along.