Tea from teavana

I like to drink a lot of tea. When I don't feel well I like it hot and durin the summer I drink it iced cuz it tastes better than water. I like to drink the teas from teavana but I'm not sure which ones I shouldn't drink. I know green teas and white teas have less caffeine in them than black teas do, and I sent thm an email asking them and they suggested to stay away from the ones with hibiscus in them and lean now towards white tea and roibois.