What Is More Productive: Halves, Dollars, Or Quarters?

Halves, but the supply dwindles by the day

Here are some thoughts based on what I have seen in the last several years:
The most likely 90% silver find is a dime. It's hardly worth the effort, though. The last one I found in the wild was last year. I can't remember the last silver quarter I received in change. It's been at least 30 years.
40% silver half dollars can be found. The problem is finding half dollars at all. Armored carriers don't roll them, banks don't want them, merchants don't want them, and people don't use them. Even when I was growing up in the early 1960s, half dollars didn't circulate. Because the refining costs are higher than for 90% silver, the 40% silver half dollars are functionally worth less than melt value.
Silver wartime nickels exist in the wild. They are scarce, simply because of age and the extremely high mintage figures of most non-2009 nickels from the last 30 years. The 35% silver content is deceptive, because refining costs exceed the silver content value. (Manganese is the problem.)

If you are looking for silver, you won't find it in dollar coins.

If you are looking for silver. There's halves, quarters and dimes.

In the 1980s aND 1990s there was more silver to find in circulation, now everyone and their brother are hunting silver since the Internet became big, so I don't spend much time dedicated to it. I pick up what gets turned into banks in my area for dollar coins and halves from people. I do not try to get boxes.

There's this misconception that half dollar boxes are loaded with silver, this is due to the roll hunter videos on youtube. These guys are either seeding their "finds" to make it more interesting for the channel or they are searching 10s of thousands of dollars a week to find what they find, although I'm sure they get lucky sometimes also like everyone else in the hunt.

In my opinion quarters are productive if you are looking to make some money on it. You can easily get $5+ for a W mint mark quarter from 2019, more for the 2020 Ws, and there is a chance of 90% silver also. Then there's double dies and all that jazz other coin series have.

You'll find more pieces of silver in dimes if finding silver is the goal though I think and it's 90%.

Most silver found in half dollars is 40% now.

For me, stopping at banks each week and picking up whatever people turn in for half dollars or large dollars is more productive and less outlay of cash trying to search boxes of halves. They are still going to usually be clad Ikes or clad kennedys but occasionally something better turns out out of people's sock drawers.

Roll hunting for silver ain't what it used to be. It's been a couple decades now of people running through them. Even setting up businesses to run through and reroll 100s of thousand's of dollars of coins a week to take out the silver.
It's been played out in my opinion by this point but a find can still happen its, I dunno, like 90% less productive than it was in the 1990s. Something like that.

I just buy my 90% silver and check around at banks for stuff people turn in and maybe get lucky with minimal effort.

If you want to just find some silver it's probably more productive to buy a metal detector and hunt for areas near you where people used to gather pre-1960s and go digging for lost change.