Neither. Since they both have a weight of 1kg (kilogram) one cannot be heavier than the other.
The weight of a single potato would be measured in grams. A bag of potatoes would be measured in kilograms.
Individual potatoes in grams. Sack of potatoes in kilograms.
Lilogram
290kg
Grams
you measure in human centipede and than you take the human centipede and divide it by 3 and then you get your answer!
In kilograms
102.15
kilograms
10 kilograms
grams
825,000
You could (theoretically) use either... However - Kilos is the preferred measurement.
I think it is kilograms
1300 grams
290kg
The weight of a guitar could be determined in either kilograms or grams, but preferably in kilograms.
You would weigh a baseball bat in kilograms.
Grams
According to this can of Healthy choice I am holding, it measures the can in ounces and in grams. A kilograms is 1,000 (one thousand) grams. A can of soup is not likely to weigh that much.