Here are top four private coins, according to market capitalization:
Monero
Dash
ZCash
Bitcoin Private
What is your favorite, and why? Maybe there will be new big players like PIVX or CloakCoin?
I think that you are missing some horses out there, on first though at least these ones:
Verge
Electroneum
Bytecoin
Deep Onion
But I am sure many will be added.