Sol got a C frame -atk(C frame is hard to comeby) and Amaterasu got a B frame -atk & def....(u can add any A frame -atk and make it 3x) with both of them stack up, the dmg deal from enemies dropped amazingly. To furthermore mitigate dmg, Amaterasu can blind & def++ while Sol remove enemies buff which make them really good~
Debuffs are considering better at the moment because it last longer than buff if u r active(180s vs 2/3rounds) , disadvantage of debuff is it has landing percentage~ which u might fail