I am trying to create account on bittrex but this exchanger close to new registration.So what is the next trusted and security exchanger?Some exchanger are so boring fro trade because of high fees delay withdraw or deposit scam etc.
You are the one who will find out what is best based on your findings. The concern part is the customer support. Most of the exchanges can be trusted in terms of security but most of them also having a negative ratings about handling customer's concern.
Delays also present at some of the exchanges especially on altcoins so you really need to bet on exchanges you will used an accept the risks.
Here's mine:
Cryptopia =
BTC0.001 to
BTC0.002 withdrawal fees
Poloniex =
BTC0.0002 withdrawal fees = my bet but expect delays