As we all know we have many talented wing backs/wingers such as Amiri, Jahanbakhsh, Torabi, Mohammadi, Alishah, Mohsen Karimi, etc. On the other hand, unfortunately we lack of having decent attacking midfielders/playmakers. Wing back/wingers is the area that we have the most depth and attacking midfielders/play-makers is the position that we have the least depth. You have to take that into consideration when you want to choose your formation and in fact you should choose your formation based on that.
Based on what I said I think 3-4-3 is the best formation for us because it lets you use almost all of your good wing backs/wingers and you do not need to have many great central midfielders. When you start a game with 3-4-3 formation, you attack with this formation but you can switch to 5-4-1 whenever you need to defend. I know CQ will not use this formation most likely but some coaches in the world do like Marcelo Bielsa. He used this formation when he coached Chile NT.
What do you guys think?
Here are the sample line up with this formation: