Epic Seven Wyvern 13 One-Shot Sigret + Seaside Bellona + Flan + Singelica 4 

If you're not running a one shot team then furious is probably better in longer fights. Flan can CR push and Crit Dmg Buff and can use War Horn while still applying two debuffs. Furious most likely will use Song of Stars for two debuffs and so you will lose the 10% atk buff from War Horn. There are pros and cons for each and depends on your team comp and gear.

@@mikechi6499 Thank you. I got it.

@@mikechi6499 If the Wyvern resist the defense break, would it take a long while to fail?(like banshee)

@@ChouChouDer Since my units are pretty slow, wyvern will typically wipe my team if def break gets resisted. If wyvern resists Flan's def break, then there still might be a chance to still clear if SSB lands her def break and if my team survives the barrage.

@@mikechi6499 Thanks. Guess I will try to build this team.