what you will chose amomg them.and why do the banks are afraid of bitcoin.why banks are not much smooth and faster like bitcoin.if banks start accepting bitcoin as payments then will it became a revolutionary for us?can bank can solve our mining or money curculation probems.
...for what?
If you want to hold currency for a long time, Bitcoin is probably better, since FIAT is subject to inflation and also can go up or down, just like BTC.
So what do you want to do with that currency? What is your goal? Because the proper answer depend on what you're trying to do.