For a single textbook, grams is better but for loads of them - for example, a year's worth - a kilogram.
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Kilograms.
It natters what you're measuring, for you kilograms would be better, because 1 kilogram is about 2.2 pounds. A 175 pound man would weigh 79378.66 grams and 79.38 kg so obviously a gram is good for something with a small mass.
grams
Kilograms because 1 kilogram is 1,000 grams and trucks are very heavy.
I think using grams is better, because it may not come more than 5 kilograms