All the other ones are closed to newcomers.
Binance today has started accepting new users ->
"Re-opens Limited User Registrations and Adjusts Referral Program Terms"I would highly recommend to use Binance rather than HitBtc, hitbtc is having lots of issues with their users and people are waiting for days for their withdrawal request to be processes even though they pay $70 in fees or more (as they increased the fees recently way too much), unfortunately I have moved the funds before happening this drama but I left a small amount there after receiving distributed super btc which I exchanged to bitcoin. In binance you have more coins and more space to trade and the withdrawal limit is 2
BTC within 24 hours which is perfect.