I have roughly 11 days off for Spring Break and I'm not doing anything, so I'm going to devote my time to using the 21 day method (well, 11 days) to learn one of the following songs:

Billy Talent - Red Flag
Billy Talent - River Below
A7x - Bat Country
A7x - Beast and the harlot
A7x - Critical Acclaim
A7x - Unholy Confessions
Madina Lake - Here I stand

Which song would I benefit most from and why?
unholy confessions, because its the only decent song on your list.