Man on the street interviews are very popular. Just going up to someone and asking them questions or otherwise interacting with the public. I prefer using a handheld because I don’t have to take time to set up a lapel on a complete stranger, and I also get less background noise I risk getting if I used a shotgun.
In this video I test 2 well known handheld microphones for man on the street. The Shure SM58 is used for many, many things. The Rode Reporter mic is aimed more for interviews. I recommend watching this video wearing good headphones and making your own decision on what would work best for you.