Thanks for your replies. By reading your posts I see the pointed differences are:
Transparency (transactions historic)
Anonymity
Autonomy (full control of the money on each person's hands, and not at banks)
Economic sustainability (as there will be a fixed amount of coins in the system, not possible to create money out of thin air)
But remember we are talking about a
centralized crypto currency. Being centralized, the government is the one who set the rules. It's not certain it will guarantee transparency, anonymity, autonomy and economic sustainability as the government can modify all these concepts as they are the developers.
There should be a model first, a government that actually use Cryptocurrency to replace fiat, but so far we still don't have one, all are just in a planning stage, but if there's one country that successfully implemented this and all the people and it's government benefited, then we will see some countries following the model and how they are implementing it, China now has the best opportunity to do that.
Yes, there should be a model so we could see how it works on practice.
Maybe facebook currency, libra, will be a good first example to see how a centralized crypto currency works.
It's going to be launched next year.