Why waste an year if want to do MBA post engineering, go for bcom finish your bachelor in 3 years and go for mba!
You would want to do engineering as a backup coz if in 3-4 years you are no longer interested in MBA then engineers get better placed then commerce graduate. If, that is the objective then go for stream which interests you most as you would end up working in that stream.
Tradionally, engineers did MBA as after working 2-3 years as an engineering, if one wants to be a manager, doing an mba helped in that. This is still valid to some extent. Except for tier 1 engg college (IITs) and MBA from tier 1 college (IIMs)
Conclusion ,
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