Bitcoin is always better than cash.For our bitcoin earnings,we are not accountable to government and we need not have to pay taxes unless it is legalized in the particular country.With bitcoin,we could easily send huge amounts of money with very low fee at high speed.With bitcoin,our money value increases,but with cash,our money just remains idle.
And even if you are traveling overseas then there is a limit to carry certain amount of cash and there is always a risk of loosing money or getting stolen or robbed but you can carry any amount of bitcoins in your bitcoin wallet and no one will come to know how higher amount of money you are carrying with you.
beside that, if we travelling into other country, we don't have to exchange our money to local fiat for every country. but with bitcoin, if we can always exchange from bitcoin to local fiat no matter where we are. and if that country have local store which accepting bitcoin then we can directly buy something with bitcoin.