Here is why I prefer bitcoins over credit cards:

1) You are right that as a payment medium there are rewards in case of credit cards while with bitcoins one has to incur a lot of fees. But you are forgetting that the value of bitcoins that you are holding in your wallet is increasing with time. Sometimes it becomes 3-4 times in a year which is impossible for money kept in banks.

2) Another benefit is that with credit cards, you are spending money that you do not have. In case of bitcoins, you are spending only what you have in your wallet.