It's hard to give an exact number as sales figures keep changing and can vary depending on different regions and editions. But Spiderman comics are extremely popular and have sold millions of copies worldwide.
It could be that the sad person in the dog cartoon is used to convey a message about life's challenges or to evoke empathy from the viewers. Also, it might be part of a character's growth arc.
Well, both have their own charm. The series brings the story to life with actors and special effects. The comic, on the other hand, allows for more imagination and detailed illustrations. It really comes down to what you enjoy more - live-action or static images.