Better for whom? It's not better for everyone. The owner of the currency should be able to choose the best method of saving. If your method really is better, others will follow.
For society at large.
And as the owner of the currency you are completely free to choose your method. BUt you seem to want the government to guarantee the return of your "investment" when you decide to keep it in fiat? Why? They arent promising you that, in fact they will pretty much guarantee you take a small haircut each and every year. Still, its your choice.