What are the best decentralised exchanges out there, and why are they good?
There is only one that I know about - etherdelta.com. It is good because of trading directly to/from your wallet to another user's wallet. There is no middleman who can be unfair.
Currently, i think etherdelta remains one of the best decentralised exchanges around and it's among the few exchanges you can get some cheap coins as its a hotspot for dumpers.
Do you know decentralized ETH exchange other than EtherDelta and Idex?
Currently is foo expensive to sell on EtherDelta - you need to pay $3 to deposit tokens, $3 to sold tokens and $3 to withdraw ETH.
Another decentralized exchange, Idex....never heard of them checking them out now out just hope I won't be disappointed with there services.