Thought I would list MY pros and cons for each denomination that I have hunted. I am mostly in it for the silver and people CRH for varied reasons, but this list works for me.
HALVES By far my favorite.
Pros: Good silver return. Even 1 40% is a decent return.
Chance for a big score! (See my "mother lode" post)
Easy to rim search.
Easy to put together Kennedy sets.
Cons: Hard to get! To get any quantity you have to order them and a lot of banks won't order them.
Ties up a lot of capital: $500 minimum and for me usually $1,000 bags.
Hard to dump.
DIMES:
Pros: Easy to get. I can often walk into a bank a get a box with no advance notice.
Decent silver return. I get about 1 a box. Most posters here get about 1.5
Easy to rim search.
Capital tie up moderate: $250 a box.
Easy to dump.
Cons: Not much variety in the way of errors, and other "keepers".
(Not many cons which is why I like dimes.)
NICKELS:
Pros: Easy to get.
Low capital requirements. $100
Lots of keepers. You find more coins before 1960 in nickels than any other. (whether those are "keepers" is up to you.)
Easy to dump.
Cons: LOW silver content,1 per box if lucky and they aren't worth much being only 35%.
Not many in the way of any good value. SLOW to search. you have to look at the date on each one.
QUARTERS:
Pros: Easy to get. Easy to dump.
Easy to rim search.
Cons: High capital requirements. $500 for a box.
VERY LOW silver content. 1 per 5 boxes for me.
Not many other "keepers" (if any).
Why bother with quarters when the other denominations
are much better.
PENNIES:
Pros: Easy to get.
Easy to dump.
Low capital requirements. $25 for a box.
Lots of keepers! Who doesn't love a
Wheat penny?
COPPER! all 1981 and before and a lot of 1982 are copper. These can be sold at a (very) slight premium. And you can horde these if you wish.
FUN! For some reason pennies are just more fun.
Cons: Value of "keepers" very low. I have even found a 1909 VDB and it's still worth <$10. Your average
Wheat penny is about .03
Storage of large amounts of copper is a pain.
Time consuming. You have to look at each one.
That's my list and I am biased toward silver. Feel free to post your own pros and cons.
Also I know some people search dollars, but I have been unable to get any in significant quantities so I didn't list them.