KCL reputation

Varies a bit depending on what you want to study and what you want to do after your degree. It's very highly regarded for law, psychology, neuroscience, and the biosciences as I understand, and has a good philosophy department. It's politics/political economy department is I think supposed to be quite good as well, and it has a fairly unique War Studies programme.

However it is I believe generally considered "semi-target" by investment banks and so less preferred compared to some other unis (e.g. UCL and LSE) by those. That said, investment banking roles are a tiny proportion of the overall range of graduate roles available so this isn't really much of a metric of anything, and is only relevant if that is your specific aim. Conversely I think for law it's quite highly regarded as indicated above, including by "top" city law firms, and so targeted for recruitment by those.

It also offers medical and dental programmes, which are as good as any other medical or dental course in the UK - these fields are essentially equal anywhere in the UK due to the highly regulated nature of the courses and very high entry requirements, everywhere. Also because the NHS (for medicine at least) has a monopoly on postgraduate training in the field and doesn't discriminate on the basis of where someone earned their medical degree, if it is GMC accredited.

So it really depends. That said, if you were looking to work in the UK after graduating at least, where you studied is usually less important than what relevant work experience/internships you gained during your degree, assuming you get at least a 2:1 or 1st overall in the degree.