I'm an L-theaninemaxxing teachad now. I have like 8-10 small bags of various looseleaf teas. What is the best type of tea?

EDIT - My collection currently:

• Vanilla Roibos (herbal/Roibos)
• Coconut Hibiscus (herbal)
• Chamomile Medley (pretty sure this has chamomile, lemon grass, spearmint, and maybe some other stuff) (herbal)
• Coconut Oolong (Oolong)
• Moroccan mint tea (green tea)
• High Misty Mountain (not sure if this is oolong or green, but it's good)
• A chai mix (black tea, this isn't good, I shouldn't have bought it)
• Assam Breakfast tea (Black)

I just finished up a chrysanthemum ripe puerh tea yesterday.