I have a question : Is binance a better environment than Poloniex or Okex ?
No doubt. Binance is the biggest trading platform nowadays,and it has the most secured transactions.
Well, poloniex is a really safe platform too, but binance is probably number 1
Binance and poloniex are at a different level, and okex is a platform with a much lower volume/transactions than those 2,definetly. Nevertheless, okex is a safe platform for any kind of transactions.