"In many circumstances animal products are more environmentally friendly. Such as using animal fat for skin care. Albeit I am assuming the animals are raised on a regenerative farm and fed naturally."

Free range, organic meat is about on par with industrially produced plant-based meat and cheese. It's still much less resources-intensive than either if you make your own plant-based meats from local, organic crops.

Key point, animals don't make any of the nutrients other animals like us need to eat. They just concentrate proteins, carbohydrates and iron from the plants they eat. While using up a huge volume of those carbohydrates, and heaps of water. Using the same resources to produce a range of plant-based food, using permaculture design, mixed cropping etc, gives us way more calories and at least as much of the other nutrients.

In case you're wondering about B12, yes, animals have bacteria living in them that shit out B12. But there are more direct ways of getting bacteria to give us B12 too.