If anything, I'd recommend you any of the AUs, like Wing, G, X, TurnA, SEED (forget about Destiny) and 00. Each series has its own story and universe and tastes may vary. If you want to engage yourself with UC titles (like Unicorn), there are a lot, not to mention, most UC titles are hard to find.
But go ahead and watch Unicorn despite what I said. Who knows, you may find yourself interested in the franchise?