Surprising, there are so many DEX I never knew. Out of this massive list, I only use Crypto Bridge and Allbit. Often I try to avoid DEX for its slow loading process, limited listed coins, and small trade volume. I think we need a clean and faster DEX for everyone so it gets more liquidity.
Idex and etherdelta are the most common decentralized exchange I use especially when I want to buy erc20 tokens or when I want to sell it. For regular trading, I still use the centralized one since I mostly trade in btc/fiat pair. Decentralized exchange is good at one side but centralized exchange still better at some points.
I also more often use dex for erc20 tokens trading for it is more complete list of tokens, though the volume of certain tokens may become my reason not to trade there. I use cex only for trading with fiat pair. I guess both dex and cex have each advantages and disadvantages.