Intelligent Or Fast Zombies; Which Would You Least Like To Fight?

The question is simple, we have seen so many different types of zombies. But when it comes down to it i think there are two types that are the most dangerous. The intelligent type, (thing land of the dead) that can learn and use tools. Evade your traps and pierce our defenses. There the slow typical zombies but there ability to think, act as group, and use our own weapons against us make them a powerful foe. T fight them you have to plan less for zombies and more for humans that won't die unless you shoot them in the head. 

On the other side of the spectrum we have the fast zombies. (Dawn of the dead remake, 28 days later, zombieland). Inexplicably this deviation of the zombie virus seams to imbue the living dead with Olympic runner like speed, reflexes and in some rare cases the ability to preform parkour. They are your typical dumb corpses but there speed means you won't be able to out run them on foot. Or at least no easily. Facing them in a large group is also tantamount to suicide. In the rare case of the parkour zombie, they may also be able to get over your walls and past your defenses swarming you inexplicably like a colony of undead ants.   

Frankly both of these are nightmare scenarios so it just comes down to which one you want to fight the least.