Kings have a Year in industry which will help a lot of with getting a job. UCL do have a higher prestige which will also help but I think a year in industry will be better.
Module-wise, I prefer UCL because they are more neuroscience-focused which I prefer. i'm pretty certain about what I want to do.
While UCL are supposed to have a large community of neuroscientists, I don't think that will directly help for my Bachelors. I heard that UCL do have a large variety of final year projects because of this but I guess I could do a BSc at Kings and then a MSc at UCL.
So yeah, I'm leaning towards Kings as well.