How would you make a career out of video game development?

After I get my programmer license I want to become a video game developer, but I got 2 options. I could either go indy and start developing flash games, or go to Ubisoft Bucharest and gain experience. Going to Ubisoft seems more logical to me, even through you rarely develop games there, like the HAWX franchise. Most of the years will be spent working on the yearly Assassin's Creeds, so how would you do it?