If they were spawned into existence for this thought experiment, then the human, probably.
But if even one of those kittens were mine, entire cities could be leveled before I let anyone hurt my kitten.
It's not quite "one million to one"; the meat from 1 million rabbits meets the caloric needs of around 2750 people for 1 year.
How about one million humans or one kitten?
Where is the cut-off point for you>?
As the article suggests, imagine you must live the lifetime of 1 million factory farmed shrimps. Would you then rather people quibble over whether we should hunt whales to extinction and ultimately do nothing (including never actually hunting whales to extinction to save you because they don't actually care about you), or would you rather they attempt to reduce your suffering in those millions of deaths as much as possible?
I don't think we can say the same of shrimp.
That's why humane killing of cattle (with piston guns to the head) is widely practiced, but nothing of the sort for crabs, oysters, etc. We know for sure cattle feel pain so we do something about it.
In any case, I just wanted to point out that if you cared about the welfare of damn arthropods, you're going nowhere really fast.
Consider this: the quickest, surest, most efficient way and ONLY way to reduce all suffering on earth to nothing forever and ever is a good ole nuclear holocaust.
I feel you're still missing the point. I get you might be coming from a binary perspective, as evidenced by going to a nuclear argument, i.e. why bother talking about anything else, but I highly doubt that's the goal of the author. They are trying to make you imagine, and think, about how things fit together. YRMV.
In reality, nobody would actually choose to save the life of 34 crustaceans over the life of a human, even if killing the prawn results in 102% of the suffering of killing the human.
It's the same with all the EA stuff like prioritising X trillion potential humans that may exist in the future over actual people who exist now - you can get as granular as you want and mess around with probability to say anything. Maybe it's good to grow brains in vats and feed them heroin - that'll increase total happiness! Maybe we should judge someone who has killed enough flies the same as a murderer! Maybe our goals for the future should be based on the quadrillion future sentient creatures that will evolve from today's coconut crabs!