Tea is never as effective at waking me up and getting me to focus as coffee. Tea also doesn't dry out my mouth, ruin my stomach, or give me anxiety like too much coffee will do (except decaf for that last one). Basically, coffee in the morning and if I need something in the afternoon, I'll drink either a small amount of coffee or a cup of black tea. At home, if I need to focus on something, I make decaf coffee as a placebo, and, if I need to relax, I'll make herbal tea. I don't put anything in either except when I drink tea to sooth my vocal chords, in which case I add honey and lemon juice.