DEX still has a long way to go to beat current top centralized exchanges. Yes, DEX did improve a lot in 2019 (remember the shitty etherdelta lol) but DEX still lacks behind in few things which can only be provided by CEX.
I remembered during 2017 wherein etherdelta was really a popular dex until the scam incident happened. That time, I wasn`t able to fund my wallet because I have really know idea in cryptocurrency. However, because of that incident I was shocked because crypto still has its weakness. We can`t say but I am really more confident to trade in CEX even there is a highest withdrawal fee and trading fee. I always follow the liquidity and security of my assets.