Generally speaking, raising a cat is cheaper than raising a rabbit. Cats can be left unattended; they find their own food and won't starve, and they can grow quite plump. Rabbits, on the other hand, will become increasingly thin if neglected and need to be fed vegetable leaves or tree branches daily, or they will starve.

However, some people believe that raising cats is more expensive than raising rabbits. For example, cats need cat food, cat litter, cat bowls, vaccines, etc., and some cats are picky eaters, so you need to buy more expensive food.
The above information is for reference only. It is recommended that you decide what pet to keep based on your own circumstances.