Which is better, the Sony A7C II or a7 IV?

For most people choosing today, the Sony A7C II is the better buy if you want a smaller hybrid full-frame camera with newer autofocus. Pick the Sony a7 IV instead if you care more about handling, dual card slots, a larger viewfinder, and more physical controls for paid work or longer shoots.

Short verdict: A7C II = better travel/everyday hybrid; a7 IV = better workhorse body.