Inflation causes money hoarding, not deflation. I can never be sure how much I will need because I don't know how bad inflation will get. I'm forced to just save until I'm sure what I have is way way more than I will ever need.
Discussion
It seems to me that neither cause any behavior. No matter how the money supply changes human action is driven by subjective value. If your value system values the token of value more than the stuff you can trade it for, you hoard. The problem with inflation is the fraud (specifically of the hidden Fed ledger), and the inefficiency of holding value over time. Deflation creates other incentives but hoarding is still illogical when you can utilize monetary energy to create subjective value in your life. Hoarding a deflationary money only seems logical because the rational actor would look at the stockpile and say "I could do so much with that." The Hoarder never has that thought no matter what the money supply is.
I think changes in the money supply do affect behavior of people who live on that money. That said, we are mostly speculating on aggregate affects. Each person is still an individual.
As for the aggregate affects, no country uses hard money. If they did, differences could come from other cultural affects. When they did was so long ago that time changed the culture. Even differences between bitcoin people and fiat people could be cart before horse. Maybe bitcoin made them like that, maybe only people like that would get into bitcoin in the first place.
I see that point. My bias is that humans generate actions not objects. But one could say it's pretty difficult for a human to BE and astronaut if rockets don't exist. Hopefully soon enough we get the counterfactual with the proliferation of Bitcoin.