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Hey @lmgn0209 welcome to the group 🙂
Ah, this is a tricky question. It really depends on your study preference and style.
Kaplan Schweser has been the incumbent of the CFA prep industry: they do good quality books that summarizes the key points, speeds up your reading of the material. They have a good amount of practice questions too. If you’re into reading from books, then practice, i.e. old school style, they are a good bet.
Then you have the new providers which are established in other exams such as UWorld, that teaches you the curriculum in a different way via active learning, i.e. learning by doing practice questions. They distinguish themselves via super thorough explanations in their answers (kinda like mini notes itself), and suit people who just want to dive in and learn actively from doing practice questions straight away. Some people complement this with their study notes and use Uworld as a source of question bank.