The differences are really night and day. Blackberry is too large to really have that "home-like" feel, it really just feels like work. Mozilla has character which I definitely feed off for motivation. The attitude of the people at Mozilla is much different than those at BB, as well. Mozilla and everything in it has life, Blackberry unfortunately feels much less-lively. Motivation at Mozilla is fueled by the love of the work and at Blackberry you really can feel the money is the end goal. Both companies are just really different for different reasons, but I definitely prefer Mozilla.