These two methods have different functions in different situations. Practicing a word 1000 times is the way for beginners to learn calligraphy. In order to write a word well, it often takes a lot of practice, even decades of repeated copying practice.
Only by mastering a word in a real sense, doing whatever you want without overstepping the bounds, or even making different changes freely, and applying a variety of calligraphy techniques, can we create beautiful words that belong to us completely.