The disadvantage of America is that only the rich can go to private schools, and only private schools have good teaching resources. Children are unequal from the starting line.

The disadvantage of German education is that children take classified exams after the fourth grade. Some go to key middle schools, some go to ordinary middle schools, some go to worse middle schools, and those who can't go to key middle schools have little chance to receive better education or even go to college in the future. Unlike the nine-year system in China, all children go to school together. You know, many children will change when they grow up. They may not learn well in primary school, but they will learn well after four or five years. But the German education system prematurely denied this possibility.

Living in Germany, Germany knows more. I hope it helps.