I learned a trick from RJ Slow on using 451V for countering different formation and it worked really well from me. 451 V is the most versatile formation if combined with good tactics.

Usually one should be comfortable adapting 3 or 4 different formation. My fav are 451v, 352v, 4321, hexagon. By using these 4 formation I won everything last season.

Note: A good formation only become great if perused with right tactic.