I think this simply sounds better because it's live. Almost EVERYTHING sounds better live. If this was studio-version, I think lotsa people would prefer SFU-version.
All you dudes talking about how SFU is more brutal or whatever horse shit than Amon Amarth are missing the point... you know why? 'Cause Amon Amarth doesn't give a fuck. They drink beer and write epic lyrics. I'm 99.9999% sure they don't give two shits about how "metal" or how "br00tal" or "heavy" you think they are. They are having a good time, and I have a good time listening to them. Last time I checked, that's what it's all about.
its sounds different but good so dont complain two different bands but its a matter of respect they honor SFU by playing this song :) so what can you ask more