Hokage tsunade is very powerful, she is able to heal 12 units the majority of the time(sometimes she'll only heal 4) but when she does that's about 24k worth of damage healed(2k if your around 60k BP). With a water main buff and an additional attack she can heal about 55k in one turn. Sadly hokage tusnade is extremely squishy and every time I bring her into GNW she is instantly prioritized. Hokage tusnade is not that great in a 1v1 match but she is amazing in Ranked battle and GNW(if you can keep her alive).

Hokage Minato is like a god right now, he is a really good ninja now and is still very relevant in the future, I recommend getting him over Tsunade since they are both absurdly hard to obtain.