Forostar said:
That's indeed a matter of interpretation. I am glad that I find new things in some European bands.
I wonder what that difference is, then. That genre is around for a while as well. How did they develop?
Short version, "Metalcore is a fusion genre that incorporates elements of the hardcore punk and heavy metal genres. The term is a portmanteau of heavy metal and hardcore punk. While the term appears to have taken on its current meaning in the late 1990s (to describe Earth Crisis),[1] the rudiments of the genre were established as early as 1989 in the work of Integrity.[2]"
Long version:
http://en.wikipedia.org/wiki/Metalcore
I'm glad you find something new in the European scene, because it is definitely not the general consensus. Again, the supposed Second Golden Era is mostly carried by new 80's Scandinavian bands with the "new" elements being either a folkish or pseudo symphonic touch, but as stated by Perun, take away these "different touches" and you essentially get a Helloween/Stratovarius clone.
The NWOAHM is much more varied, again, just with Atreyu, Avenged Sevenfold and Mastodon as examples. Atreyu combines clean vocals with growls backed by a traditional metal sound. Avenged Sevenfold sings... "cleanly" M. Shadows voice is very raspy due to fucking it up during his stint in a death metal band, you can tell when he literally strains to reach higher notes, it is masked though through layered choruses. Mastodon's vocal and musical style is much more thrash, with aggressive, but not growling vocals a la Metallica/Motorhead.
Compare that to say.... Nightwish, Epica, Sirenia, Therion who all use the Opera soprano/Death growl formula with symphonic elements. or Hammerfall, Sonata Arctica and their progenitor Stratovarius. While far from 'symphonic" they do stick to high range vocalists, though male, unlike the symphonic bands that usually go for female leads.
To the untrained ear at the very least, though the people here probably know more about metal than the average joe, the American scene is currently more varied, if not more innovative, than the European. However, BOTH movements are enjoying a wave of popularity lost to metal through most of the 90s.