Given the background description of some cooking related query, summarize the question into a title
Q: Many commercial cake mixes use vegetable oil, but I have seen some (usually 10% or less of what the store carries) that are "Butter Recipe".These use butter instead of vegetable oil. What is the difference in these? And is the reason you do not find many in stores is because it is not popular, or costs more, or something else?
A:
What is the difference between regular (vege. oil) and butter recipe cake mixes?