I'd say BitBay, first time I see a crypto that has made every promise it made real.
The dev is the first to have integrated smart contracts in crypto, fhe made the douple deposit escrow which is a genius way to force honesty in transactions that no one has ever done before which he added to bitbay and now one of the best features ever is getting prepared called the rolling peg, basically allowing less volatility for vendors and buyers but allowing growth for investors.
It's genius and should be at least top 20 imo.