Of course there is a US dollar coin.

Okay, I phrased that wrong. I knew there were dollar coins in the US, and I'd heard there was a $2 bill, but I was aware that they were pretty much never seen in general circulation. Our loonies and toonies replaced the corresponding bills, so we have no choice about what to use! And we'd "always" used $2 bills, before the toonies, without confusion...but that brings me to the next post about confusing bills...

Confusing bills are never a problem in Canada, because each bill is a different colour (five=blue, ten=purple, twenty=green, fifty=red, hundred=brown). When I've travelled to the US I've been extremely confused because your $20 bills and $1 bills look essentially the same, to one who is used to looking for colour!

I think what this comes down to is whatever you're used to is the best. As a Canadian I'd never realized how much the colour coding was burned into my consciousness until a few trips to the US where all your bills look like they should be twenties!