Which of those do you think you'd like to go with?

--it's obvious or you presume?
Rather than mincing words, what is your view on animal consciousness if it is not that consciousness exists on a spectrum? Do you believe that animals are not conscious or that they are equally as conscious as humans?
YOU may fancy the "they're conscious" line, but most people do not make that their guide. Elsewise, they could not feel angst over the killing of baby seals but not think the same about deer hunting. IOW, your argument fails.
My argument fails because some people disagree with it? How does that disprove my argument?
That is ONE argument among many. Apparently it's the one you favor. But I'm willing to bet that you're also against killing animals for food if there is no suffering.
I'm on the fence on that topic, and here's why. First, it's hard to imagine a case where we could practically kill animals on a large scale without causing suffering. Many animals have rich emotional lives that involve other animals, and it is well-documented in many species that there is often mourning after an animal is killed. Further, the techniques used to kill an animal without suffering are likely not going to be foolproof, and the standard in which we raise the animals would be so much higher that it is likely impossible from a practical standpoint.
Second, and more importantly, I cannot reconcile my belief that it is wrong to kill a human, even if suffering is not involved, with the idea that it is acceptable to kill an animal if he doesn't suffer. While there is a difference in humans and animals, it is a difference in degree. Thus, if it is wrong to kill a human, it is at least somewhat wrong to kill an animal.
Hypothetically, if we knew there was zero suffering involved in killing an animal, I would not oppose killing the animal, but that may commit me to saying the same about killing a human.
Because there is a difference?
I agree that there is a difference, but it is a difference in degree. If it is wrong to kill a human, it is at least somewhat wrong to kill an animal. I asked why you draw a distinct line. No morally-relevant line exists between us and other animals -- it's all shades of grey.