As long as the cat/kitten has a low prey drive- either should be fine. The biggest concern with letting a bunny and a cat or kitten play together is the difference in how they play. Cats like to wrap their front paws around their playmate and bite and kick- and while that is usually fine between kitties- bunnies are more delicate. Bunnies are more prone to abcesses and a little bite or scratch- especially a puncture that traps bacteria- can easily turn into an abscess that is not apparant until weeks later when the infection and swelling or drainage is noticeable.
I have 5 cats and 3 bunnies- and I do allow them together- but I watch to make sure the cats do not “play fight” with them- not only can it injure the bunnies they are not impressed with it at all. Sometimes a grooming session between the cats and the bunnies starts to turn into “play fighting” too. One of my bunnies will actually nip my cats in the belly if they stop grooming her! So I have to watch her more carefully than the other bunnies since I have to worry about her instigating a bite or kick response from the cats.
Boday language concerning grooming seems to have totally different meanings for cats than it does rabbits!