Machine head - Imperium

I am trying to learn songs that I feel will push my playing ability and force me to learn new techniques

I am planning on running through a lot of Machine head Slipknot and trivium songs as I understand some are very intimidating.

I know pretty much all trivium songs are nuts and I am not planning on skipping any parts I feel no need to make it easy on myself

I know slipknot and machine head have a bunch of easy songs but I am looking at learning songs start to finish what are some of the hardest ones? from them bands

So I asked 2 questions sorry my brain is fried.
Stuck in a Haze.
"hard" is so relative. Why one guy thinks is hard another girl might laugh at.
Check out my band Disturbed
It doesn't have to be hard to learn the technique. Just as long as there's a solid use there for you to learn by.
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Looks intermediate from looking at the tab, it would be good to learn for practice. A lot of Trivium's songs are more intermediate leveled too. I learned a bunch of songs from shogun back when I first got a 7 string. It was good practice since the songs were a bit more technical than what I already knew at the time.