Easton's B4 from the Worlds wasn't stock at all. No company will send their racers to the Worlds with stock cars.
Both cars have their benefits and drawbacks. No one on the internet can decide for you..and every time this question is asked, it turns into a flame war..so please refrain from any more "Losi vs. AE" threads.
That said..I am a Losi guy, and am always available to answer any questions anyone may have about Losi and their products; that's why our team exists, and we're all here to help.