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Not much is known about Karin's abilities, except that she's quite a good chakra tracker. Furthermore, we know that she can heal others by biting her. However, this technique requires a lot of chakra, as we could see in the battle with Hachibi. She's not considered a medical nin.
Ino has always been Sakura's rival and, after the Time Skip, she's a medical nin as well, but not at the same level as her rival. We do know that she's not gifted in Taijutsu, but she's quite good with her clan's Ninjutsu...
I believe that neither of these two girls has shown their true potencial yet. Either way, who do you think would win a one-on-one fight?