There are quite a few challengers to that title but cracks me up that some of us are like old farts Monero wise I think this year will be very important for growth and I expect accelerated adoption in plenty of places that have been waiting, watching on the sidelines etc. regardless of what happens in the overall market (which is relevant for price action). In the past another way to attack Monero has been to divide interest by increasing competitor chains, all of whom have pretty much abused the lack of formal system in place & ripped off the market. I see pretty much most of tired and the beaten (or even scammers themselves) respecting what was built here.

ZCash I think is going centralized POS and again we know how centralized systems are only going to attract VCs, fraudsters and Pump and Dumpers. That chain has self deprecated into irrelevance in the bigger picture except price manipulation and backdooring into centralized exchanges. Their problem is that BTC already exists for CEX price action.