What's the difference between teaching Kindergarden and teaching First Grade? How do you choose?

I’m in college to get my degree to teach K-3. At this point in my college experience I am deciding on what grade I want to teach. It’s a very important step in being a teacher for me at least. I was wondering what the difference between teaching Kindergarden and teaching First Grade is and which one is better to teach. :) Please respond, it’ll help me out a lot thank you !