I may say the big advantage of having bitcoin agaisnt the cash, is the huge possibility that our bitcoins be worthing much more on the other day
When you look at the potential positive impact of the price going up, you also have to look and mention the fact that the price can go down real hard. If you only look at the benefits and not at what risk you are exposing yourself to, then you're doing something wrong. Especially when you just assume the price will go only up. Exactly this is where a lot people go wrong.
the low cost transactions
If you would use Bitcoin on a daily basis like you are doing with fiat right now, then you will notice the impact of the "low cost" transactions. On average the fee that people include with their transactions is $0.05-$0.10. If you compare that to the free transactions you are enjoying in your local area when paying with cash money or your bank card, then you'll see and notice the difference.
plenty control of our money.
If you have everything in your own wallet, and not in an online wallet service, then that's exactly the case.