Neither, really. It's actually kinda hard to make me happy or sad, I just live my life and face whatever it throws at me. When something happens, good or bad, I acknowledge it and figure out how to move on as quick as possible. Hate to say it, but I remember feeling pretty much the exact same when a) my sister graduated university Saturday and b) my childhood friend's dad died of cancer a few years ago.
Basically, my mood is either content or irate. I either let something slide, or get pissed about it and then let it go. I'm content most of the time, so I'll vote that I'm a magical content unicorn.