I'm playing recently the English opening. specifically this line in the two knights variations
[FEN ""] 1.c4 e5 2.Nc3 Nf6 3.g3 Nc6 4.Bg2
But I find it difficult to see when it's advantageous to go queen side with
a3 b4 idea rather then play in the center with
d4 later on.
Any thoughts ?