Try a moderately oxidized oolong or a shou puer first imo. They have a lot (or more) of the robustness of black tea without as much tannin. Japanese green teas

Try a moderately oxidized oolong or a shou puer first imo. They have a lot (or more) of the robustness of black tea without as much tannin. Japanese green teas are technically very fine but they are usually extremely vegetal, and likely to be strange or disappointing if you're not specifically seeking that. Matcha is basically an entirely different drink with separate preparation tools and quality criteria etc. It's a fun thing to get into if you want a mildly hobby-like source of caffeine.