"That's sort of like asking a parent who their favorite child is. It's very hard to determine. Sometimes I'll get feedback from somebody who liked this part of the show. Others like another part of the show"

This quote by Lance Burton is a metaphor for how difficult it is to determine what individuals like. Similar to a parent can't choose a preferred kid, it is difficult to identify what individuals like in a show. Burton is saying that he gets feedback from individuals who like different parts of the show, so it is difficult to determine what individuals like total. This quote is a suggestion that everyone has various tastes and choices, and it is difficult to please everybody. Burton is emphasizing that it is very important to take feedback from various individuals into account when producing a program, as it can help to create something that interest a broader audience.