Queen's Indian Defense

 Queen's Indian Defence - Barcza-Golombek Stockholm Interzonal 1952

What is the best response to 3. ... b6? It is difficult to tell as Queens Indian Defense allows for a number of strong lines to develop. In this game Barcza played what we call now a Spassky System. However, may would argue that Petrosian Variation is much more aggressive and even Kasparov Variation is better then Spassky System as it advances White's developement. I would like to read some opinions form the Chess.com community on this.

4. a3 Petrosian 

4. Nc3 Kasparov 

4. e3 Spassky