Another Bullet For My Valentine fan, they do rock :cool: . First things first, not to be a jerk or anything but the string numbers should go like this:

d----------|
a----------|
f----------|
c----------|
g----------|
c----------|


Teqnically they would both sound the same because if you pluck the 7th fret on the 6th string then pluck the open 5th string they would sound the same. That same thing goes along with playing the 5th fret 4th string and then playing the 10th fret 5th string.

I'd go with riff two, I played it along with the song and it sounds perfect and is a lot easier to play than the first riff since you don't have to fret that 6th string.