If u r in a big group then Sakura
If it's a small group then Karin.
Karin's healing is faster, but her chakra runs out after she has healed u once or twice so she can't handle large groups. Even still having a sensory ninja is a huge plus. Karin can also protect herself with chakra chains.
Sakura however can heal large groups, Use summoning so to keep downed soldiers safe, can cure many types of poisons, Katsuyu is good for remote healing, relaying intelligence, and acid spray. Sakura is also really proficient at countering genjutsu and she can punch really hard Lol
If it's a small group then Karin.
Karin's healing is faster, but her chakra runs out after she has healed u once or twice so she can't handle large groups. Even still having a sensory ninja is a huge plus. Karin can also protect herself with chakra chains.
Sakura however can heal large groups, Use summoning so to keep downed soldiers safe, can cure many types of poisons, Katsuyu is good for remote healing, relaying intelligence, and acid spray. Sakura is also really proficient at countering genjutsu and she can punch really hard Lol