>>47070322Sheer Force Iron Head is significantly better against Golurk, Reshiram, Buzzwole, Palkia, Probopass, Zekrom, Necrozma-DW, Mega Glalie, Zacian-C, Kyogre, Aggron, Mega Fug, Wailord, Steelix, Alolan Exeggutor, Regigigas, Kyogre, Heatran, Snorlax, Necrozma-DM, Hoopa-Unbound, Avalugg, Stonjourner, Metagross, Zygarde-Complete, other Copperajah, Giratina, Dialga, Zamazenta-C, Melmetal, Glastrier, Calyrex-Ice, Stakataka, Guzzlord, Mudsdale, Groudon, Eternatus, Cosmoem, and Celesteela.
Sheer Force Iron Head is slightly better against Tyrantrum, Rhyperior, Mamoswine, Golem, Hippowdon, Mega Gyarados, Zygarde-50, Torterra, Coalossal, Alolan Golem, Arceus, and Mega Camerupt.
Heavy Metal Heavy Slam is better against everything else.