For me, it is FETO but if someone argued fro Scum, I'd argue not.
It's "Scum" all the way; side one's filthy, lobotomized Celtic Frost-meets-Discharge protocrust lurch'n'burp creepycrawl (think "Siege of power") is so much more interesting and feral than FETO's high-impact/low-dynamic sheer velocitude, which is admirable enough as an exercise in extremity but simply fails to hold up as a viable listen over the long haul.
And how about that first Peel Session? Possibly the fastest record I've ever heard. I know that there are, of course, even faster records in simnple BPM terms, but nothing that so effectively and consistently defies the metronome rut at such velocities, probably due pretty much entirely to having Mick Harris beating the living shit outta them poor skins.