I have friends who completed their B.Com from Calcutta University and Burdwan University and according to them, it's difficult to get a BCom degree from any of these two universities. Because it is honors, and you must also manage a large syllabus. 

As far as the curriculum is concerned, Calcutta University and Burdwan University are identical. Even Burdwan University asks the same questions again and over. 

You will have to put in extra effort to do well in academics at both Burdwan University and Calcutta University. However, Calcutta University has a locational advantage. You will have better access to coaching. Calcutta University is also more recognized. 

I will suggest that you take all these factors into consideration, and choose an institute according to your convenience.