I have never used Poloniex but out of the exchanges I have used I've never had a problem. This may be because I haven't been using them long enough.
I think we have to understand how hard it must be to run an exchange and all the work that goes into keeping one running especially with all the hacks that have happened over the years they must spend a lot of time and effort in keeping our money safe before they spend time and effort on anything else.
RE: Poloniex vs Binance