Hey,

Both the courses have their own benefits and depends on the student what they want to pursue.

Diploma is a technical course which will help you grab job opportunity as well as some colleges also offer higher education to diploma students.

12th Class from a  recognized board has no technical value but for higher education 12th is the best alternative and it will help you get admissions in graduation and other higher education.

When we compare a 12th passed with a diploma holder the diploma holder has more benefits as compared to 12th student in professional field.

Thus, if you want to have a technical diploma and want to take up a job or other higher education you can go for diploma, and if you want to study and go for higher education i would suggest to go for +2 after 10th.

I hope this helps.

All the best!