Hello Abhishek,

I think b.com is much better for banking then B.sc.

Hello Abhishek,

           Coming for banking mathematics, accounts and you even need to know about finance even so coming to Bsc and bcom...

Bachelor of commerce is very useful...

All the best....

Hello Abhishek,
The eligiblity criteria for bank exams like IBPS,SBI PO etc. is a graduation degree in any discipline. Therefore both B.Sc and B.Com will make you eligible for appearing in these exams.
As you asked, Pusrsuing B.Com would be better as the syllabus covered will be relevant and useful in your further banking career. It will also help you in preparing simultaneously for entrance exam as some of the syllabus will overlap with your B.Com. 
The following link might help you in preparation-
https://competition.careers360.com/articles/banking-jobs-focused-preparation-must-crack-stiff-competition
Hope I resolved your query, feel free to ask further questions.