Like any "genre", noisecore crosses over to some specific close genres. Debate when exactly band is PURE NOISECORE is quite useless. Does couple intro-like starts of grinding riffs in beginning chaos make it "grindcore"? Hardly. If amusing hardrock ballad melodies are attached between moments of chaos, does it stop being noisecore? And where you draw the line who is what, when almost none of the bands had consistent style in their discography. Most certainly later days Anal Cunt isn't exactly "noisecore", but I don't know who listen to those. In the glory days when it was more about compressed high blast energy than retaird humor, most definitely prototype noisecore.
Some of my personal favorites have been, and always remain:
AUNT MARY (fin) 600 song 7"
7MON (aus) especially the early years with 7"s.
ANAL FIST (ger) 7"
B.G.T. (ger) 7"
W.B.I.(ger) early stuff, especially 7"s
TUMOR (ger) demos and early vinyl before became hc band
ANAL CUNT (usa) stuff before debut LP
ARSE (fin) -demo & live tapes. Been trying to get it re-issued for years.. we'll see when I get masters...
EXTERMINIO BRUTAL (bra) all tapes
NOISE (bra) all vinyl and tapes
INDUSTRIAL HOLOCAUST (bra) especially first split 7", but later more musical is fine too
SORE THROAT (uk) all, but especially Death To Capitalist hardcore 7", Abrahams Ear 7", Disgrace to the Corpse of sid 7"
from pre-noisecore one could list many bands, but Brigado Do Odio remains the absolute favorite. Even their comeback 7" was good, even if not as phenomenal like stuff from 80's.
Who are the good noisecore of TODAY is much more harder task to think. I tend to know all the people personally who somehow impress me with what they are doing. I started with some irrelevant noisecore blasts in '92 and in '93 playing in band called Noise Waste. Almost last 10 years operated in Nihilist Commando, which noisecore done as I thought (& think) is the ultimate form.