Which is the smartest genus of the great apes family (excluding humans)?

I've always wondered which is the most intelligent: chimpanzees (and bonobos), orangutans, or gorillas. After watching some videos on members of these genera, it seems like gorillas are the most intelligent when concerning thoughts and biotic interactions, orangutans are the most intelligent when concerning interactions with abiotic things/plants, and chimpanzees are the closest related to humans while seemingly being the most intelligent generally.

thanks in advance for your responses