May I say 'both'? Bitcoin is 'running block' for us, Wiser: first-to-market. Once an individual, though, has some competency with Bitcoin, they may well consider other cryptos, and choose one of those.
And here is where I put in a plug for IndiaMikeZulu's model, P2P-friendly: if you set someone up with Not-Bitcoin as their first crypto, you then have a fine chance that they will both stick with that coin, and become part of its P2P/merchant network.
Have you noticed my constant interest in the altcoin-cap-to-Bitcoin-cap ratio? Your question is why I watch it. And just a couple of days ago, there were four cryptos running multi-mil-$ trading-volumes!
Mark (IndiaMikeZulu), Australia
All markets are fundamentally alike. Do we all still drive Ford Model T cars? After the ground breaker has had some success, the innovators come out of the woods, happens all the time, everywhere. If you build a better mouse trap....
Bitcoin is exactly like the Model T. It's not the first but, it is the first SUCCESSFUL crypto. Some people innitially saw both as a threat, some saw them as a amazing opportunity to change the future. Human nature will always trump the statistics and predictions, on both sides of any issue. Crypto, in some form, will always be with us far into the future. DNotes could well be the replacement for the Model T.