Netcode efficiency

Is netcode good for making games similar to clash of clans? Will everything sync smoothly? If not, what will be a better option?

 

It‘s really not so much an issue of the networking library magically making everything sync smoothly. You can make it sync smoothly, but you could as well muck about and make a terrible mess of it. Just like you can write any program efficiently, or not. It‘s your work that makes the biggest difference.

You should try to understand what specific features are important to have in a networking library for a given game (genre). Here‘s a feature comparison chart: https://forum.unity.com/threads/updated-free-networking-solution-comparison-chart.1359775/