Crio Bru can have up to about 5g of caffeine in a cup, depending on the bean; that's about 1/20 of what coffee has. Rooibos "teas" are actually not really tea, but an herbal plant that's dried and brewed like tea, and has no caffeine. You can get rooibos in different flavors, and I like all I've tried.
Just for comparison:
(Type) (#g caffeine/cup, average)
Decaf Coffee 0.3g
White Tea 2g
Oolong Tea 10g
Green Tea 10g
Mate Tea 100g
You make your choices, and you live with them. In the end, you are those choices.
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