I always use cash, however soon that won't be legal tender.
The financial system is going to crash, it's was designed that way and unfortunately we are living when it is going to happen. I wouldn't be surprized if everyone loses all their saving in the banks. It's getting harder and harder to get cash from the banks as it is. When you try to get a few thousand out you're asked, 'why, what for!'
We will be told it happend because of a cyber-attack, no doubt.
Digital currency will be surveillable and programmable. Say or do the 'wrong' thing in the real world or online and you money can then be frozen. That type of thing is already happening to some people.
Plus of course, those nasty, dirty, bank notes and coins are just covered in germs and 'viruses.'