It's unfortunate it's a ranking... there could be huge or tiny gaps between the entries.

The original source https://www.frontiersin.org/journals/sustainable-food-system... links betterproteininstitute.com which then links https://www.betterproteininstitute.com/_files/ugd/7be592_a59...

The emissions for lamb/pork/beef are terrible, beef looks an order of magnitude worse than the rest. The top 10 or so are fairly similar in comparison. Chicken isn't bad comparatively, but tofu still looks a decent bit better.