UCLA Psychobiology vs Neuroscience

Hi, I’ll be entering UCLA as a pre-Med freshman, and I am debating between majoring in psychobiology or neuroscience. I heard psychobiology would be easier and that neuroscience is ultra hard, but I’m definitely down for a challenge. If I got he psychobio route, does it have enough of the medical school requirements, or will I have to add on more science classes. Is it also true that w/ psychobio u could graduate earlier than 4 years? I’m conflicted bc I know a major like neuroscience is very time consuming, and I also want to be able to study abroad for a year or so, so which major would allow me to do that? Thanks