The difference is that MCM/ICM is more influential internationally. The Asia-Pacific Mathematical Modeling Competition has great influence in the Asia-Pacific region.
If you are applying for an American university, I recommend you to participate in the Mathematical Modeling Competition for American College Students.
Event settings:
Competition purpose
Innovative consciousness and team spirit focus on participating in fair competition.
guiding principle
Guiding principles: expand the scope of benefits, ensure fairness, promote teaching reform, improve the quality of competitions, expand international exchanges and promote scientific research.
Scale and data
The national mathematical modeling competition for college students is one of the largest extracurricular scientific and technological activities in colleges and universities in China. The competition is held in September every year (usually from Friday to next Monday on a weekend in the first half of the year ***3 days and 72 hours). The contest is open to college students all over the country, regardless of major (but the contest is divided into undergraduate group and specialist group, and all college students can participate in the undergraduate group competition.