Tea is my favorite beverage as well. What I drink depends on the time of day mostly.
Every morning I start my day with a cup of Irish Breakfast Tea. (currently drinking Barry's)
During the day on cold days I'll have cups of Chai tea. For a daily brand I kind of jump around but I keep an eye out for things like "Double Spice" variants.
On hot days I cheap out and go with iced tea which is typically just regular Lipton or even Arizona brand Diet Green Tea.
If I'm at a restaurant I nearly always order tea. I rarely drink soda at all.
Every night before bed I have a cup of Chamomile Tea. (currently drinking Tazo Calm)
On special occasions my overall favorite tea is to brew the Samurai Chai Mate loose leaf tea from Teavana which I have a dedicated cast iron tea pot for that's been "seasoned".
I never drink decaf black/white/geen/oolong. If I want decaf I'll drink an herbal or rooibos tea. Just a weird quirk of mine.