Hey,

It is totally upto you which course interest you more and that you may easily manage with your ca. I would prefer you to opt for bcom programme. Basically it would rather easier for you to deal with it along with your ca as the course and syllabus for bcom programme comprises all that you have studied in ca. So it would be a bit easier for you to score good marks even if you skip classes. Also most of the ca aspirants either chose bcom programme or bcom hons because it goes along with they course and get a better revision of it.

Rest it upto you what you prefer and chose!

Hope this helps.