[DestructoSphere]

Personally i find reaver best for cracking routers with WPS enabled if you have a decent signal you should not get a failure to associate. if i do it i run it overnight and when i get up in the morning i have a WPA2 password. with aircrack this can take days/months/years depending on password complexity and length. with WPA2 you can have a password between 8 to 64 characters although i find most to be between 8 to 12, even so if you are trying to brute force this can take a while.