What is better 4800 mAh Or 3600 mAh?

It's not a question about "better", it's about what's most important to you - weight/size or runtime.

The 4800 mAh battery will last longer, but will probably also be bigger/heavier. More to carry around.

The 3600 mAh will last a bit shorter, but will be smaller and lighter.

You have to decide what you prefer.