Are weighted pull-ups more beneficial than regular pull-ups?
It depends. I would say mostly no, because if you get really good at regular pull-ups and they are no longer a challenge for you, there are still plenty of ways to make them harder and progress without adding any weight. You can do close pull-ups, L-sit pull-ups, archer and one arm pull-ups and so on. Some calisthenics athletes prefer this approach and others like to add weight to increase resistance because it is quicker and easier and does not involve as much skill. So, I would say neither is more beneficial, it just depends on what you like better and what works better for you. You can try and do both ways, say in two different sessions a week and see what suits you the most, but you don't have to really choose either. You can just do both if you like both. Good luck.