Congratulations on receiving the offers! Well done :)
To answer your question directly on the criteria you have mentioned:
- Prestige: For sure the prestige of working in an MBB overbears other firms, regardless of the location. Even if you DID have preference for location and were prestige sensitive, then I would recommend you to still take the MBB. Since you do not care much about the location, its a clear decision to choose MBB!
- Types of Work: While the type of work seems to be same, it is quite often different. Here's how:
a) MBBs work with a premium level of clients. Big 4 will not always be working with premium clients, and may work with price sensitive clients (often T2/T3 clients too).
b) MBBs get much more strategy related projects, whereas Tier 2 and Big 4 get some strategy projects and a lot of implementation/detailed level of projects. Its upto you on what you prefer.
c) MBBs also have a bit more leverage to push back to client when it comes to unreasonable deadlines/pressure thus the work life balance is slightly better in MBBs than in Big 4
- Exit Opportunities: Exit opportunities depend a lot on Prestige and Types of Work. Thus MBBs > Big 4
Let me know if you need any further help via DM. All the best!