In the post 4-4-2 era, teams all over the world play a variety of different formations. These formations change game by game or even within games, so it is becomingly increasingly difficult to nail professional teams down to just one single formation. That being said, two of the most popular formations in the world right now are the tactically flexible 4-3-3 and 4-1-4-1, both of which have been used heavily by Pep Guardiola throughout his career. Ultimately the formation has to suit the players that you have and their developmental, psychological and physiological characteristics. But the 4-3-3 and 4-1-4-1 are two very similar formations. The 4-1-4-1 is perhaps a little more physically demanding and tactically complex, while the 4-3-3 is perhaps more rooted in wing-play and the collaboration of the midfield triangle. Although these formations are very similar, they can offer a team a completely different dynamic, depending on how a manger or coach wants to implement them.