The choice is clear 
If long-term to continue MBB path, pick HBS. (GSB kids don't like consulting that much)
For Finance, GSB = HBS (GSB has higher percentage of people going into PE/VC/HF. But HBS has more population -size wise)
For everything else (especially tech/VC), GSB > HBS
Both schools don't really care for IB (especially GSB). This is different from Wharton MBA, where there are still quite a few graduates entering IB.
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School vibes are very different. HBS is still very case-driven. GSB is more balanced approach with more humanistic touch.
