Which brand of copper door locks is better?

They are all similar. The main thing is whether the color of the outer panel matches. It is usually a red bronze color, similar to the door. It doesn’t matter what brand it is, the key is the appearance you like. It’s usually zinc alloy, red bronze and European style. I would be embarrassed to install a stainless steel one. .

Locks are actually universal. If you have double doors, you can just install a fake door handle.

Moreover, the door itself must have matching locks and door handles