Wow! What a match
I have exactly the same firm and insurance choices in the UK, but for law (And I don’t want to go to any of them).
Personally, I am leaning more towards McGill for a reason that I can build my degree (have a major+ a minor or two), which allows me to explore my interests in different areas. It is important for me because well-rounded education is really appealing to me. And I would have more degree/career flexibility.
Why wouldn’t I go to UCL/KCL? That’s because at the time I applied to UCL/KCL (which was half a year ago), I did not realize that I don’t want to study law. Law does not give me much flexibility with career choices, meaning that it would to an extent “determine my future”, because with a law degree you’re most likely to end up as a lawyer, which I’m not sure I want to be. So I would prefer McGill just for the reason not to study law and have more degree flexibility.
Talking about your situation, I would say that KCL and McGill are pretty much on par academically (UCL a bit higher up).
About KCL: it’s in London, which is a great networking place and has good employment opportunities. KCL economics is definitely more selective than McGill’s, which makes it seem more prestigious. (But that does not mean that KCL is necessarily better. That’s just because McGill’s socialist policies force the uni to admit loads of people into their Arts faculty, most of whom won’t study Hons Econ because their maths is not good enough. Idk if you’re is Desautels or arts though.) Unlike McGill, KCL doesn’t have funding issues, so the facilities are be better there. UK is entirely English speaking so that might be beneficial for you if you’d like to brush up your English and distance yourself from French. However, you should keep in mind that the UK is leaving the EU and it’s not known how smoothly this will happen and how much it will affect you as an EU citizen.
McGill: it’s a very well known university across the world. It definitely has a better reputation that KCL in overall perception of the university, which might not be the case in economics. (McGill is well known in both Europe and North America, while Kcl is mostly known in Europe only). Montréal has vibrant student life and is very compact, which gives this cosmopolitan city a cozy feel. Flexibility of courses at McGill. If you’re an IB grad you can finish McGill in 3 years instead of 4. Probably the tuition is cheaper at McGill for French citizens than in KCL, idk though, I’m not French.
From my perception, KCL seems a better place to study economics, but that could be because I live in the UK and I hear a lot about KCL, and not much about McGill
Another thing that confuses me is the reaction I get when I tell people that I got into McGill VS KCL. Everyone is like: McGill?!... cool!! And I receive a more neutral reaction when I tell people about KCL. Although people look at me as if I’m crazy when I tell them that I’m planning to decline my UCL offer.
I think that these universities are pretty similar academically, so you better look at other factors, such as location, language, job markets, your intended country for work, proximity to your family etc.