For me it is...
1. '64 Kennedy's, full weight and less likely to be faked. 429.5 million minted.
2. Mercury and Roosevelt dimes, both have their upsides with age vs. full weight. A fat sack of silver dimes is a great feeling. 14 of them for a toz.
3. Morgan Dollars, premiums ugh!, but they are my favorite US coin. Pre-'21 is better. Many Morgans have a "beautiful" look to them. Not MS67++ bs, but a "I'm an old coin with so much history that I demand respect!" look to them. They feel heavy in your hand, real money!
I rescued this old gal from a garage sale last year for $20. 100 years older than me and she still looks good!

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4. Peace Dollars, heavy coins, but BORING!!! Always a weak strike and a terrible follow-up to the Morgan. They stack well though.
5. Franklin's and Walking Liberty's, nice, old looking coins. You know they are old, without looking at the dates.
Way down the list...
Barber Dimes, Quarters, and Halves, I hate you! Any that I've ever had are thin and worn out!
Standing Liberty Quarters, you are the too thin and politically correct for me. I WILL buy the 2016 gold quarter though.
Washington Quarters, how I loathe thee. If I could rub two of you together and get a worn Franklin, I would. I'd almost trade you for two dimes if I had the chance. No love for you!
One reason that I buy PM's in the form of coins is the history behind them. If I had several million dollars, I would by all the 1936-1939 5 Reichsmarks that I could. No love for Hitler here, but his rise to power in a western country will be still be discussed for 200 years. From a prisoner for treason to fuher in 9 years to a nation is ruin in 12 years, is scary.
All my Roosevelt dimes are from the post-war boom of the late '40's to the early '60's.
All my '64 Kennedy's are a reminder of November '63 in Dallas, Texas.
My silver is real money and history that you can hold in your hands.
Shoutout to post-'92 90% dimes, quarters, and halves! Nothing but love for you. Modern 90% dollars, toss off!