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I will answer your question with another question: Do you have to choose one or the other?
I am a veterinarian and I work with cats, dogs, chickens, horses, cows, goats, and sheep. I couldn't decide which I liked best, and so I get to work with them all. I really love horses and love to work with them, but I also like cats and dogs a lot.
My recommendation is to spend time with all different sized animals, and maybe one will become your favorite. Or maybe you will decide you like them all and work with all of them. You don't have to pick one or the other.