Hello, pursuing Bcom and CA simultaneously is a very good career option. Many people choose to do their Bcom from open to give more time to their CA exams preparation. While some choose to do their Graduation in regular mode to get the college experience while simultaneously studying for their CA exams.
I think one can manage regular college and their preparations if he is fully dedicated and disciplined.  No outsider can have the correct answer laid out for you. In the end you only have to make the decision, evaluate your situation, will you be able to make a schedule take allows you to study for your exams while attending regular classes. If yes, you should go for regular college otherwise You always have the option of correspondence.

Thank you and good luck.