Why should you choose a crypto broker?

Why should I choose a crypto broker over other options for buying and selling cryptocurrencies? Isn't it simpler and more cost-effective to just use a decentralized exchange or a peer-to-peer platform? Are there any specific benefits that a crypto broker can offer that make it the better choice for investors looking to get into the cryptocurrency market? Additionally, how can I ensure that the crypto broker I choose is trustworthy and reputable, especially given the potential for scams and fraud in this space?