Yes, Zoro got angry & decided to use a Technique without first deciding the appropriate one,
You think Zoro wins by unleashing Attacks stronger than previous ones? Not necessarily, He must select which one fits the situation,
You think Sanzen Sekai for example would have worked against Braham or T-Bone or Kaku or Daz Bonez or Ryuma? ... etc
Stronger Attack doesn't mean it's the right Attack to Use, it depends on how will Opponent answer,