If Binance was smooth and good for you why are you looking for an alternative? Anyway, the altcoin exchanges that are pretty okay based on my experience and are decently reputable are Huobi Global(HBG), OKEx, and probably Bittrex(though I haven't used it in a year). But as always, do your due diligence when it comes to any exchanges.
I want to say the same.If he do already have smooth experience with Binance then why he do still look for other exchange? Stick to it on where you do feel comfortable and suit out your needs.Answering up the question then i would go with Okex my next choice.