#CEXvsDEX101
In short, my friend ..
Use CEX if: you are a beginner, prefer an easy-to-use interface, need high liquidity, do not mind leaving your money in the exchange's custody, and want to trade with fiat currencies (like the dollar).
Use DEX if: you have experience in cryptocurrencies, prefer complete control over your money, care about privacy and anonymity, and are looking for new cryptocurrencies that are not yet listed on centralized platforms.