Hello Aspirant
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The BFM and regular BCom are similar but a lot different.you can choose anyone that they are very close to each other.however BCom is overall good degree whereas BFM is focused on finance only majorly.
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BCom:

Here you will study all about market, management, business, accounts ,economics, communications and financial marketing and accounts.

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Career option:
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1) export import manager
2) Banker
3)tax consultant
4) insurance consultant
5) finance consultant
6) event manager
7) lecturer

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BFM:

Here, you will study everything related to financial marketing  for the span of two or three years.
If you want to do job in financial sectors go with BFM.
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Career option:
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1) accountant
2)tax consultant
3) human resource
4)banker
5) auditor
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If you have any questions further let me know.
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Thank you!!!!