Attack wins matches,defense wins championships!

[Tactician]

By the way, 4-5-1(V) if far from being the best defensive formations. It is one of the best counter-attacking formations though.

The best defensive formations are those that provide two lines of defence and 10 men behind the ball. This is up to you to find out what they are and how to use them. You might beat a much stronger team by minimal scores as low as 1-0 or 1-0 aggregate with some of those formations, but it can be said that they are effective as the most important thing is to beat that team or knock it out of the competition, isn't it?