Both series do things the other cannot. Because of its necessary scope, The Wire never gives us the extensive point-of-view that The Sopranos does; but then, The Sopranos doesn't have the scope to deal with socio-economic concerns on the same level as The Wire.

Also, The Wire is grounded in social realism; The Sopranos often does away with it and we get surreal dream sequences as important narrative threads.

If The Wire is Dickensian, The Sopranos is Shakespearean. As such, they're pretty incomparable, and both excellent.