Sort:  

personally I am at poloniex I find the platform serious

It depends for which kind of trades and on which coins.
I'm using Bitfinex and it is for me the best platform to trade on main coins and for day trading/short trades.
Take care.

Coin Marketplace

STEEM 0.18
TRX 0.16
JST 0.030
BTC 62784.93
ETH 2465.43
USDT 1.00
SBD 2.63