I like the 1oz silver rounds as I give them to my niece and nephews. I have given 1oz bars to them with the 'MerryChristmas" artwork. To me 1oz is 1 oz.... There are some fractional silver rounds but I really dont see any sense in going lower than an ounce.Can someone school me on coins vs 1oz bars? currently trying to figure out why someone would buy coins over a bar. And why so many different bar options?