2

What is the difference or best way for creation instance of new class?

Object manager?

or

Define in to constructor?

2

Using __construct() method defined inside php file,

Demo example,

protected $_entityResource;
public function __construct(
    \Magento\Catalog\Model\ResourceModel\AbstractResource $entityResource
) {
    $this->_entityResource = $entityResource;
}

Why we have to not used Object Manager inside file, please check community thread, ObjectManager

1

As per my opinion its better to use construtor instead of Object Manager. We should not use the ObjectManager directly! It defeasance the purpose of dependency injection. We can use ObjectManager, if there is no alternative.

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