Direct comparison
JEE Main is used for many engineering admissions and as the qualifying route for JEE Advanced. JEE Advanced is the entrance route for IIT undergraduate admission.
When JEE Main may fit
Choose this option when its eligibility, learning style, admission route and career outcome match your strengths and goals.
When JEE Advanced may fit
Choose this option when its structure, depth, future pathway and required preparation are more suitable for your plan.