We all have our favourite formation, I have found 3-1-4-2 has brought me a great success rate, I can sub my DMC for a third striker if things are not going well, that gives me much threat upfront, if I'm winning a tight game against better or near my teams skill set then IT can either take of a striker and put on another defender playing for at the back, or take a CM off, play one in the middle and put on another CD . I find the 3-1-4-2 formation the most easiest to tinker with during matches.