Well op has a few points.

BTC will never scale.  it now does  300,000 transactions to 500,000 daily transactions = it will never scale up. It is much better for large value movements. Much like a 10,000 USD bond.



I have looked a lot at the setup of pow coins. to me something below may be good.

BTC = 10,000USD and up value movements. very good price to move large amounts very secure.

LTC = 500-10,000USD value movements.  very good price to move medium value very secure and faster then btc

Doge = 1 to 500USD.   one of the cheapest of all to move coins.  super fast.


All of the above are very secure.

All of the above are backed with a lot of ASICs miners.

If you want a money system the three above work really well.

All other coins are more or less for trading on exchanges.


But you could  maybe supplement most if not all fiat with those three coins.

I still find a flaw with all of them.  The 1/2 ings come too quickly and all will have issues when rewards get too small.