Neuroscience has a reputation for being a bit easier since you have a wide variety of classes to choose from in the neuroscience, biology, and psychology departments. This allows you to avoid difficult classes like genetics or moderately difficult classes like cell biology that everyone takes as a biology major. However, I wouldn’t say that the difference is completely clear cut; some neuroscience classes are also really difficult, like molecules of the brain and neuroanatomy. And if you’re pre-med, you still have to take hard classes like biochem anyway.
I would say that students should stick with what they are more interested in. Neuro isn’t so much easier that I would recommend someone interested in bio to switch. For someone who completely doesn’t care though, it might be worth it to do neuro instead just for the chance that it might be slightly easier.