Your best bet is still Binance at the moment.
You made a good decision to switching from poloniex, in my opinion. Despite Circle's acquisition they seemed to not have made a lot of progress in terms of upping their overall service, including withdrawal problems and customer support issues that are still being reported in the past few months after the acquisition happened.
As a former legacy poloniex user, I can say that the transition to Binance is by far the easiest because I think all the features are quite similar to poloniex. They are also one of the most trusted exchanges at the moment with a 2 BTC daily unverified withdrawal limit which is awesome. They're the logical choice to make I believe, as their PR has been pretty good in the past as well. All the other exchanges such as Bittrex, Bitfinex all have much more major issues that I wouldn't want to get involved as a user with.