I'm not an expert on the economics, but as of now, Bitcoin hasn't been hacked, which suggests it lives up to its promises. Personally, I find it incredibly useful to be able to carry my wealth anywhere on Earth, just by remembering a few words.
We should be cautious about whether past precedent applies to future bitcoin, because the bitcoin halving mechanism ensures that bitcoin enters uncharted territory (with regards to the incentives at play) every four years for the next ~100.
Satoshi's design was that bitcoin would be used as cash and transaction volume would provide the funds to secure the network. That largely hasn't happened (it's a "store of value" now, lightning exists, etc.), so mining incentives are still ~95-98% funded from the exponentially diminishing supply of new coins.
Short of some institution stepping in to secure the bitcoin network by mining at a loss, it's hard not to imagine a 51% attack being relatively cheap on the time scale of decades.
Unless you're Canadian protester and the government freezes your bank account.
Unless you're American, like Melania Trump, and the bank decides to kick you out and take away your credit card because the politician sent them a letter threatening "oversight" if they don't kick out "risky" clients.
Unless you trip bank's fraud metrics and they freeze your account for months, refuse to say why, ignore your attempts to contact them and fix it.
Unless you're Russian and U.S. bans you from using international banking system.
Other that that, there's no difference.
Currency is not a “thing”—it is a promise. We invest in promises, whether currency, stock, etc.