In my opinion, they are not really competitors and there is no better here. Both currencies have different use cases.
I believe bitcoin mainly use, for now, is to make the transactions that banks do not allow you to do, or that they charge very expensive fees. Those transactions ares remittances, currency conversions, payments in another currency, etc.
Another great use is as store of value, especially in time of crisis.
Yes I agree of what you say. They have both have different in use.but in term of value for a digit # we know that bitcoin is big than usd fiat.they both have a value.money like usd use in actual money in term of purchasing.unlike bitcoin you can not see actual and can not hold in your hand because it is use only by digital technologies by cellphone or computer.they both useful in our life but for me bitcoin is easy to access.you can carry where ever you are as long as you have cellphone and use to transact in paying or purchasing where ever you are.and can not be steal by some one it is in a safe place that no body can steal unless they know your password but we know that it is hard to hack.both are important in our life because we can use them in everyday needs of our lives.we know sometime the value of usd money and bitcoin is in beyond of the holder of this currency.it is up to you how will you use it they both same in use this is for purchasing and for payment.the advantage of usd money was this is a known well fiat money that every one use unlike bitcoin some peole didn't know what is this.