Black Clover vs Seven Deadly Sins
Connection:
Both Both of them are short shonen manga protagonists who live in a world with magic (Asta wields a five-leaf grimoire with an Anti-Magic and Devil inside & Meliodas is the son of the Demon King)
Both have special powers that revolve around magic (Asta's Anti Magic and Meliodas' Full Counter)
Both are part of a chaotic group (Black Bulls to Asta and the Seven Deadly Sins to Meliodas)
Both of them wield demon killing swords (Asta's Demon-Dweller Sword and Meliodas' Demon Sword Lostvayne)
Both are the love interests with silver hair that are part of royalty (Noelle Silva and Elizabeth Liones).
Both of them possess a form of anti-magic (Asta's sword and Meliodas's Full Counter)
Both have connection to a demon lord that gave them their abilities (Liebe and the Demon King)
Both of them have a best friend/rival that is the their polar opposite (Yuno Grinberryall and Ban respectively)
Both also eventually earned the respect from their respective kingdoms (Clover Kingdom and Liones)