The debate between pantsing and plotting is, to my knowledge, well known within writing circles but mostly unheard of by everyone else. To those who are unfamiliar with the terms, pantsing is making a story up as you write (in other words, "by the seat of your pants"), and plotting requires laying out the story's narrative skeleton before putting figurative pen to paper.
Some authors try to claim one way or the other is the "correct" approach to writing. You can ignore those people. They probably ate too many paint chips. They also probably kick puppies. Instead heed the advice of most authors: pantsing and plotting are two means to the same goal, and you should use the one that naturally works for you. If you feel more creative and free when pantsing, then go for it, no matter how awkward the statement I just wrote may sound. If plotting helps you to focus on writing because it gets planning out of the way first, then have at it.
The two methods are not mutually exclusive, however. In fact, I believe you should use both if writing something of novella length or longer. Try gaining advantages of the other method while sticking primarily to your own. For example, pantsed stories almost invariably requires far more editing after draft one. Having a few milestones planned out, such as critical plot moments, helps you to stay on track. Pantsing is notorious for inefficiency and unfocused narratives.
On the other hand, if you're a plotter like me, you have much to learn from those insane, free-spirited pantsers. While your world-building may require advanced planning, your narrative can flourish if unchained from your original plan from time to time. Keep in mind that your first ideas are not always your best. Until the moment that a story goes to print, be open to new character and plot ideas that pop up.