Favourite trading platform will have to be Kraken, used to be a fan of Binance, but after the recent scandals, I refuse to support it.
Been playing around with DEX's as of lately, and hate the slow trading using atomic swaps, until I discovered Stakenet's DEX which is Lightning Network compatible, which means not only is the trading fees VERY low, but trading is also instantaneous.
Next problem is liquidity, which they solve through the use of a #DEX Aggregator", which basically combines multiple DEX order books (From other DEX's out there) through API calls, and adds them into the Stakenet DEX, which opens up for a LOT of liquidity, and benefits all the existent DEX's out there as well.
Here's a screenshot: