In the asset management industry, there are two undisputed heavyweights: BlackRock and Vanguard. They rival each other in almost every category, but this month Vanguard overtook BlackRock as the largest US ETF issuer — a title BlackRock had held for two decades. Despite their dominance, the two firms have very different reputations, cultures and approaches.

On this episode of Trillions, Eric Balchunas and Joel Weber speak with Manuela Sperandeo, co-head of European iShares at BlackRock, and Jonathan Cleborne, managing director for Vanguard Europe. They discuss the rise of ETFs in Europe, passive investing in a market increasingly dominated by a handful of giant companies, and what it's like to compete with one another. This episode was recorded live at the ETFs in Depth Conference at Bloomberg's London headquarters.