Which Provides Better Performance?

These are the fastest ones, but the other ones add some extra functionality e.g. model() gives you a shared instance, so it's a matter on how you store yours, if you get the same performance. If you just make new ones all the time, that are slower again.

Code:

use App\Models\MyModel; + $model=new MyModel(); + $model->myMethod($data);

Code:

$db = $this->db;