I wouldn't call Gojira thrash, not sure what to call 'em actually. I recommended the song "The Heaviest Matter in the universe" mainly because of the riff, but I don't think it's musically less complex than Sabaton.
Thanks for the recommendations, I didn't fall in love with them on first listen, but I'll give them a good coupe of spins before forming an opinion.
One thing I noticed is I think the guitars are too heavily quantized for my taste.
Challenge accepted.