I've lived in both Berlin and London, and while Berlin definitely has much cheaper rent and some great startups (Amen, Soundcloud, etc.) the London startup scen

I've lived in both Berlin and London, and while Berlin definitely has much cheaper rent and some great startups (Amen, Soundcloud, etc.) the London startup scene is still larger by an order of magnitude on pretty much any measure (number of startups, money raised, exits, etc.)