Andy Murray's racket is heavier than Roger Federer's, which can either be a good thing (assuming you have developed muscles and can lift heavier rackets for MORE POWER), or a bad thing if you don't have that kind of muscle strength. My sister has the Roger Federer racket and is very pleased with the results because she has an average muscle strength so the lighter weight is advantageous to her. But Andy Murray's seems like a fair bet.
In conclusion:
Andy Murray's if you can lift a slightly heavier racket.
Roger Federer's if you can't lift a slightly heavier racket. (In user reviews on the argos website, the paint is said to chip off quickly, but if you don't mind, go for it.)