If it for a caffine bost then it depends up on how you make the brew. Most Americans just wave a tea bag over the cup when making tea as my British wife tells me. If you make tea like the British or most of the world then you put boiling water over loose tea leaves and let it seep for 15 minutes or so. When go back vist the in-laws in London half a cup of tea will give me more of a caffine boost then 2 or 3 cups of coffee.
But if it is for a warm drink then it is your pick or evne hot chocolate can really boost moral.
cheers