Kazuha, Sucrose, and Venti are only similar in their elemental aspect. When it comes to their abilities and kits, they are quite different. I won't recommend you compare these characters only based on their crowd control abilities; rather, see how their abilities affect your team synergy. Venti is awesome when it comes to crowd-controlling enemies in a large area and regenerating energy particles for your team. Sucrose and Kazuha are unique in their roles and different from Venti regarding ability comparison. If you want to know about them, I recommend you go through their character guides.