Not to start an A vs B debate, but why do you say that? I've been up front in the NG, and I don't see anything too cutting edge.
It's less about what you see and more about what's behind what you're seeing CA. Higher power consumption and numerous discrete devices using point to point architecture were the norm for 1980's designs (A320 and subsequent variants) compared to the 1990's designed boxes of the NG, which incorporate more integrated digital electronics, using the latest chip technologies, programming, and streamlined architecture.
While the A320 is a more evolutionarily advanced aircraft, mostly due to the ingenious FBW system, the 737NG's electronics are a generation ahead. It's a bit ironic, yes?