Jawaban:

Dolphins are much smarter than octopuses. There is no comparison. But there may be a specific way to think of the word "smart". Some octopuses are smart enough to change color based on their surroundings, although that may not be a function of the brain. An octopus would be better at trying to traverse a pile of rocks than, perhaps, a dolphin at trying to navigate a maze of narrow canals - and in that case, his brain. The octopus will participate in the decision-making process.

Similarly, a person is more intelligent than a pig, but a pig can better avoid being caught by a tiger in the forest than a person, because pigs enjoy the benefits of instinct. I think instinct can also be considered a form of intelligence.