I think there are many DEX to choose from to sell erc20 tokens,I think the safest is Uniswap because we don't need to enter a private key and for trading fees all need gas for the DAX market.
The best I think at the moment is that of the uniswap which I think is more convenient IMO. Though, this is my first time actually hearing about the forkdelta and others (erc20 exchanges) and I don't think this will be a better option than uniswap. Based on many forum member judgement, uniswap is the best for now in the community for the exchange of ERC20 tokens.