Bitfinex is the best crypto exchange platform around. It offers the most liquid market, a huge amount of pairs and all the analytic tools a trader needs. A new trader might take a wile to get used to the UI but that can be said about any platform really, the important thing is that after you learn it there's nothing missing - and that cannot be said about most platforms. Now i've to point out the negatives as well, and it falls on the verification process, it does require a lot of information taking a long wile before you get fully verified and ready to trade.
With all on the table i do still think Bitfinex is the best crypto exchange in 2020.