Oooh me! Call on me! I know the answer!!!
The one that hits a vital organ or critical component of the central nervous system.
Temporary cavitation may help in cases where "close enough" means the round in question passes close enough to say, the heart, that cavitation causes structural failure of one or more branches of the aorta or the pulmonary artery.
But I think I'd rather play horseshoes or hand grenades than try to rely on temporary cavitation to incapacitate.
And given that the average human heart is what...fist and a half-sized or there abouts, any of the three rounds in the picture could obliterate it fairly effectively with a direct hit, regardless of temporary cavitation, though if I had to pick, the 6.8x43 would probably be my choice.