Both palisade and stone walls. The win rates may be significantly changed if walls were stronger. You could punish upon a rush player by hiding behind your thick walls of doom, and boom. While rush player has post-traumatic stress disorder scratching on your walls of doom.
More HP, and cheaper cost etc. Bad players just auto lose on open maps with no chance to hide behind walls.
Walls are next to useless on open maps. Only closed maps like black forest are they useful.
Stone walls will be buffed in next patch during feudal age, but the reasin for this is arena.
It is easy to break the walls with villagers and do silly stuff in arena after ageing up to feudal.
If the defender is following a fast castle build order, tower rushing him can be devastating, because noone expects such an early attack. The easy way to fix this isbwoth stronger walls before castle age.