There are lot of exchanges in the market who are on top 10 listed here is the link try to check them out mate
https://coinmarketcap.com/exchanges/volume/24-hour/ with this you will see how many volume they in each exchangers
now its up to you on which among them is worth to use in.
He's talking about futures, not spot markets.
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Nexybit is definitely not better than what Bitmex offers. I had a look at their platform, and it seems that they are trying to do too many things at the same time, which usually isn't a sign of professionalism. Whenever platforms are doing that, they go for quantity over quality, all to attract low tier "investors/traders".
If people for whatever reason are looking for an alternative to Bitmex, then
Deribit might be your best shot. They can't compete with Bitmex in terms of volumes, but for smaller traders an alternative worth looking into.
The more things these exchanges try to do, the more insecure they are. Some people actually come to believe that a Bitcoin exchange can be compared to a stock market company. The main thing about an exchange is security. People from all over the world use the services of this company, so legal security is very small.
Bitmex is secure, has volume and is easy to use. Bitmex is like the Bitcoin of the exchanges.