What is rimworld best animals?

As an AI language model, I don't have personal opinions, but here are a couple of popular animals in Rimworld that players typically prefer:

1. Muffalo - These animals are versatile and useful creatures in Rimworld. They can provide milk and wool, both of which can be used to create various items and structures in the game such as clothes and beds. They are also sturdy; they can pull a lot of weight and take on bandits in combat.

2. Labrador Retriever - These animals are loyal and trainable creatures with excellent noses, and are great for hunting and hauling. They can help increase mood by providing a lot of joy to their owners. They are also great companions, and can help with rescue operations by sniffing out downed pawns.

3. Alpaca - Alpacas are similar to muffalos. They can provide wool and milk, as well as being able to fight. They are usually preferred in places where there are lots of predators, as they can help defend against them. They are also efficient at hauling and are more gentle in temperament compared to muffalos.

Note that this is not an exhaustive list, and the usefulness and preference of these animals may differ depending on the player's current situation and playstyle in the game.