There is one winner here and that is Bitcoin, I know some people think BTC is not a privacy coin but it is absolutely one and will certainly shallow all these Altcoins. There are alot of privacy features that would be added to it in coming months and the tech would be better than what if have seen in the space
Yes Bitcoin is one of the best crypto but it is not a privacy coin. Monero is the best choices if you want a privacy coin and besides it has a ring confidential transactions.
There are some loopholes in monero I just read in one article that I forgot. They have specified it very well. If I remember the token that is better than any other privacy coin I will put it here. But for now my vote goes to Komodo.