About Walls.
I dont think there has a lot of difference btween of walls and nonwalls. Cause the army can work like walls to defend your base, thats what viper and daut are doing. Of course the walls are might give you an advantage when you make them at the right time and in the right map. I saw many games which one has'nt walled even simple palisade, and won against stone walls. Last one, If you're not walling, then you should have enough army and micro instead of walls.
I dont think there has a lot of difference btween of walls and nonwalls. Cause the army can work like walls to defend your base, thats what viper and daut are doing. Of course the walls are might give you an advantage when you make them at the right time and in the right map. I saw many games which one has'nt walled even simple palisade, and won against stone walls. Last one, If you're not walling, then you should have enough army and micro instead of walls.