It's funny you're not mentioning Litecoin or Bitcoin Cash, which are designed for faster pay transactions.
Nano, would be great but it's early days for DAG in terms of attack vulnerability, which is vital in crypto.
In fact it's more important to understand the different types of crypto, and what they're focused on. Check out this post i made recently.
It's also vital to understand what tech these coins use: PoW, Pos, dPos, DAG, a mix. As PoS evolves, it should get more reliable. You can't beat Bitcoin's PoW decentralisation robustness, bear in mind, which is why it's a favourite, a store of value, digigold.
What about Steem? as a payment option accepted in stores one day? That would be cool. dPoS, but the Steemit inc, should be focusing on developing this as we speak.
I maybe should have mentioned Litecoin and Bitcoin Cash, these are focusing on faster pay transactions than Bitcoin, but my focus was on even faster coins. And yes, Nano has had its security issues which was the reason for the massive price dump. This article is just meant to start a debate and have more people involved in thinking about where crypto is headed. One of these faster payment options will probably gain a huge user base as well.
At this time, Stellar network is my preferred. For when you buy a coin, you're investing in a network, in most cases. I think you could say almost, 'understand the network, and understand the coin.'