I prefer to use paper money because its use is very easy and flexible. almost all transactions can be used with paper money but if to invest better with bitcoin because bitcoin has a fluctuating price so if used to invest will get better results than banknotes

I can not use Bitcoin as the usual money here in my country. Shops and restaurants do not accept crypto currency and I have to exchange it for ordinary paper  money. Thats why Bitcoin and fiat have different purpose for me. Bitcoin is an investment and a source of income.

Bitcoin is like a new girlfriend.  I have to give her attention every single day.    Fiat is like my wife, who needs some attention, but not so much.   Gold is like (well, this is just an example, because I actually bought a house near where my mother lives so I can visit her often) a mother who you can basically just call once a year to say Merry Christmas, because you know that the value isn't changing much and will be pretty much the same.

There are more credit CARDS in America! It has to do with your lifestyle!

When you tip someone, you can't transfer money using BTC! This is very troublesome for the waiter! It's very convenient for you to use paper money, and other people too.

As of the moment, paper money is more liquid compared to bitcoin. Banks nowadays have a difficult time distinguishing what bitcoin is and do not see it as a currency. On the other hand, having paper money is being accepted all through out the world. Bitcoin is still on the verge being regulated by some countries. For example, there is this news wherein an airport is converting to be cryptocurrency friendly where they would be accepting Bitcoin and other alts as payment for coffee, tickets etc. Apparently, people go into bitcoin thinking that they would make profits due to the volatility of its value. Having paper money would have a more stable price. Having a physical currency is accepted and more realistic for other individuals compared to bitcoin being a speculation for some people.

BTC is pretty liquid.  What if you could have 10% more BTC than paper money?

Well, we have different reasons why need fiat money rather than bitcoin or vice versa. Some people who dont have enough knowledge about bitcoin or those who really need a decent amount of money prefer having fiat money. But those people who wants to invest money for their future life prefer having bitcoin because its their way on how to gain a huge amount of profit to be use for their future life.

I live in a very small town, you can say - the village, and I simply do not have the opportunity here to use bitcoin. I use it for international transfers or for payment of some services, but in real life I have to use paper money, I want it or not.

Bitcoin has seen a lot of action during the past few months. There has been huge volatility in the price, and there are many people that are investing in it without knowing what it really is. I think in the begging, it was people who were idealistic and investing in it long term. But then it became about people who are just putting money on it simply for the fact the price has been rising.
I think what really makes paper money safer than Bitcoin is the fact that governments can ban it (to a great extent). (The price was going to continue rising, but I think that announcements from governments about possible regulations are the reason why prices aren't rising like that anymore.)
That's probably the reason why fiat money would be preferred by many over Bitcoin.