It depends on your course and location preference. Both Loyola College, Chennai, and PSG College of Arts and Science, Coimbatore are quite reputed. 

• For Viscom, Mass media, and literature courses, Loyola College is more reputed.
• Whereas, PSG College is well-known for Commerce and Science courses. 

You will get good exposure at both institutes. It’s better to choose a course first and look for facilities for that course at both colleges.