'I won't grow up' or 'We will grow up'

Which did you think was the better song in this movie? Personally I always loved "I won't grow up"...when I was a kid I practically had that memorized in my head and I always thought it was the better song because in as many years that I watched this movie as a kid, I never saw any upside to what the boys were talking about when they sang "We will grow up". It always sounded to me like it'd be more fun not to. What did everybody else who saw this movie think was the better song?