Hi there,
Let me tell you about Aesop's fable about the dog and the bone. There was a dog who was given a bone by a local butcher. It was super happy about about this and ran to the river to chew on it. However, upon arriving, and looking into the river, it saw another dog with a bone in it's mouth. Thinking it could snatch this bone away, it dove in with jaws open. It's own bone fell out and drifted away in the current as the 2nd dog reflection vanished with a splash. The dog was left with nothing.
I'm not saying BCG will rescind its offer if you ask for more time. But, if you "might" take the BCG offer, you're ultimately going to. This is the offer I'm presuming you actually want (I'm interpreting from your text...but you ultimately only you know).
If you think you prefer BCG, then the only reason for interviewing with McKinsey now is ego. Drop the ego and be happy with what you got!
That said, here are pros vs cons.
Taking the BCG offer
- 0 risk to reputation
- 0 risk of rescinded offer
- You'll forget about the McKinsey interview quickly
Trying to delay
- Get to know if you'd get McKinsey
- Get the choice between the two
- People tend to forget (if you delay at BCG), and you'd mostly be talking to HR to delay the signing date
Final Note: If you genuinely are undecided, then you can ask BCG for a few weeks to just think through it...again, only do this if you're genuinely undecided (I don't think you are)
(editiert)