This might be a pedestrian choice to long-time tea drinkers, but I have only recently started drinking black and green teas on a regular basis, and my brother-in-law who was visiting told me his favorite is Assam tea. So we got some, I tried it, and I agreed, I really like it. Tart and bracing. I couldn't begin to tell you why it's different, or articulate beyond those two adjectives why I like it, but it works for me.
Pithy quote here.