Kataklysm isn't really Death metal, they're just Extreme. I haven't given their new disc (In the Arms of Devastation) enough spins to say anything, but Serenity in Fire really grooves quite nicely. Nile though, well they are technically much better than Kataklysm. I mean Black Seeds of Vengeance is one badass album, along with all the others. Gotta say NILE!