What is IDEX?
IDEX is the first Ethereum based decentralized smart contract exchange to support real-time trading and high transaction throughput. IDEX is the most advanced Ethereum DEX, supporting limit and market orders, gas-free cancels and the ability to fill many trades at once.

Guys this is my personal opinion, idex is much faster, you can adjust the gas fees to min as possible, transaction very fast. Very light compare to etherdelta.

Its worth to try.

https://idex.market/faq

almost all popular pair available

https://idex.market/eth/btcm

https://idex.market/eth/rz

https://idex.market/eth/ebch

https://idex.market/eth/eos

https://idex.market/eth/eagle

https://idex.market/eth/snt

https://idex.market/eth/kick

Does the other exchange have more volume compared to Etherdelta?

Of course not, it's new. That's sorta like expecting Binance to have more volume than Bittrex within a month of launch.

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It wouldn't make any sense for you to change websites.

Hmm, how exactly will they get more volume compared to ED if everyone keeps using only ED while waiting for IDEX to get more volume? Undecided