I think centralized exchanges are still better because it is more convenient to use most of the time. The only hassle people get when using them is KYC (in some centralized exchange). If decentralized exchanges were to develop further though, I think they would be a lot better because it will also let users who do big volumes of trade to exchange their coins and at the same time, keeping their anonymity, without the need of disclosing their identity to some exchanges.