generally, I don't trust centralized exchanges (because they are not very secured) and prefer to use decentralized exchanges.
What's your reason, and how is DEX more secured than centralized exchange? did you know that one of the DEX was hacked before?
https://mashable.com/2017/12/21/etherdelta-hacked/Cryptocurrency exchange EtherDelta gets hacked and replaced by a fake site that steals your money
But the major issue i have is that most of these decentralized exchanges don't have much volume and liquidity like the centralized ones.
That speaks the reason, people trust CEX more than DEX because they feel it's safer, and because it's regulated, they can go after the site unlike DEX of course.