Screw the La Masia propaganda, those Catelans buy players like there's no tomorrow. I've seen the great Marc Bantra step in defence against Bayern, boy got raped a new one.
Well they hardly bring through many great defenders, but obviously their system is midfield and attack based, so the list of Busquets, Pedro, Bojan, Messi, Fabregas, Pique, Icardi, Iniesta, Reina, Valdes, Thiago Motta, Alba, Arteta, Puyol and Xavi being schooled there in the last 15 years is rather impressive.
I'm not sure where are strong area is going to be in particular, we don't have an established style and method like Barcelona do, but the youth teams are supposed to be moulded to be ready for the first team.