egan.
daylightdies.com
I thought this video did a good job. I'll note the obvious: less thrashy riffs and leads will show a far greater difference.
The end result for me, on a personal level, was that this test forced me to re-evaluate how I record metal rhythm tone. On the project I did after this recording, I went way outside my comfort zone & tried some techniques that were quite a departure from my normal method of recording metal rhythm guitars. I wound up getting the best tone of my life!
I must agree with Mago, I found the editing really frustrating. You show one guitarist playing palm mutes and just when you're waiting to hear the exact same riff from another guitarist to really figure out the differences you have them playing chords.
Actually, they all play the same parts, just at different times. Everyone plays palm mutes, everyone plays chords. Use the time slider if you want direct comparisons.
There is a difference mostly in dynamics, attack and tightness and a little bit of tone, people who can tell the difference are deaf.
1st guy is by far the tightest, most even dynamics, lots of pick attack and sounds the most aggressive in the mids.
2nd guy picks a bit soft and is about as tight but it sounds bassier and with less presence
3rd guy and Glenn sound very similar, loose, lots of low mids in theirs and lots of high end noise.