Botch are Mathcore, which differs from Metalcore in that there is a greater emphasis on speed, technicality and complex time signatures. There's a progressive element to it.
Metalcore is bands such as Killswitch Engage, As I Lay Dying and Bullet For My Valentine. Breakdowns, harmonised riffs, double-bass pedals and drop-tuning are key elements. Screamo differs in that it's a dissonant confluence of Emo and Hardcore Punk, characterised by melodic guitar-interplay, frantic tempo and dynamic shifts, and an intense angst/melancholy. Metal and its conventions aren't typically an influence.
Of course, this is purely my take on it all. Genre's a murky business.
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