SMT I have no preference really. Anything larger than a dime should be banned for use. Distracting to most.
2" is just a souvenir imo. I have several of the poker chip types in my bag but never use them. Always have 3 dimes in my pocket, which have been there for years(same dimes). Worth about a nickel totalđ.
Skulls(for markers that is) always seem to be fun though. See them on a lot of bags, HCs, balls, etc.