I don't have a single favourite (outside of "If We Hold On Together"), as I'll admit that I just wasn't the biggest fan of many of the sequel songs, but there were a few I actually did enjoy. "Standing Tough", "Big Water", "Always There", "The Legend of the Lone Dinosaur", "Bad Luck", and "Bestest Friends" all stand out to me. I'd need to see the sequels again sometime, as I can't remember all the songs off the top of my head and so there might be a few other good ones I'm overlooking.