Poloniex has not really impressed me in the last few years as this exchange has very few coins and poor liquidity is the main reason I feel satisfied. I think at present Binance is still a very good choice for investors and you can freely trade here without any problems. Poloniex used to be the number one exchange in the past, but after a long hiatus, this exchange was only a small exchange.
If you weren't impressed by Poloniex few years ago, then no chance for you to get impressed now. Either you are new to crypto trading or not easy to get impressed. It's a favorite centralized exchange few years ago beside bittrex, now the time has changed and I agree that Binance is one most popular exchange to use even though it is maybe not the best exchange that most decentralized people are looking for.