Yea wild-hunted venison is probably a much better comparison, I'd probably agree that whale meat is better for the environment then farmed meat but ultimately you have to account for scale. It would be impossible for the world to live on whale meat alone, much like it would be impossible for the world to live on fish, or non-farmed crops. It's good to have a variety of food sources both for culinary enjoyment as well as food security and sustainability.