It's between speed vs. decentralization. Which coin will be adopted by most? Many say it's in the top 20 already we have still decided what we're going to use as THE PROTOCOL coin. Educated opinions welcomed.
All I can see is Monero and ethereum is the next big thing although there are new coins coming in which tries to be as decentralized as possible with a very good speed, the next big thing, in my opinion, is yet to come or just around the corner waiting to get launch.