LSE hands down. If ur an LSE grad, especially in finance/economics, then ur looking at major money jobs in the city (IB/Consulting). Not to mention, that, like it or not, switching from LSE to kings/birckbeck for Phd is easier than the other way round. LSE is not the best economics university for nothing. If ur thinking Phd, and funding is an issue, then LSE will get you into US Phd programs with scholarship. Kings/bircbeck are fairly unknown in US.