As a fan of midfielders, I like the way Jovetic moves effortlessly from midfield to attack. And he also showed last season that he can play on the left of a front 3 quite easily.
Bojan is a good penalty box player but perhaps lacks the physique to become a truly great player. He has a natural understanding of all Barca's movements, having graduated through their academy, and therefore benefits hugely from the service he get from Messi, Iniesta and Xavi.