I have do say, I did enjoyed the Ocarina much better than the Harp. The Ocarina actually had an abundance of Songs that had many effects. When using the harp you strum the same tune for every song, and there are very few songs. You can also not play the song whenever you want and they all only do one thing and are used only about once. The Ocarina was much better in my opinion.
You can't really do anything with the harp. Its kinda fun, but I think it could've been a lot funer. The Ocarina was awesome. You could do so much more on that thing then just play the songs that you learned. You could change the key and everything!