In general if:
- The brand of the operations consulting role is good (eg Tier 2)
- You enjoy operations and would be willing to work there in MBB
Then I would choose the consulting role. Otherwise it is more difficult to say. If you enjoy more the Big 4 role and hate operations, there is no real reason to go for the first option just for what you could do in 1-2 years.
You can also check the exits with the two options on LinkedIn for your target office for a more data-driven answer.
Hope this helps,