Defiance played cool yet typical straightforward US thrash metal, nothing special in their sound but they learned their "how to thrash" lesson.
Anyway I only own "Void Terra Firma", maybe "Product of Society" kills 10 times more
I wouldn't bet on it. Both Defiance and Sadus were very by-the-books thrash, nothing special. So, don't expect anything spectacular. But if you want some alright thrash to distract you for awhile, honestly....either one would do fine, really.
Sadus were much more leaning towards technical death metal though, I've never heard that "Vision of Misery" but the few songs I know so far are really good.