LogFAQs > #975802641

Our corporate structure goes:
Site
7 Directorates
4-10 departments in each directorate
4-8 divisions in each department
3-5 groups in each division
10-20 people in each group

I started at Group A, and climbed to Engineer 3. I got a lead position and a promotion to Engineer 4 in Group B, within the same directorate (but different department). Group B is responsible for the disposal work literally after what Group A does, so it was a good transition of work and a good opportunity to learn cradle-to-grave of this system.

10 months in now, and a lead engineer in Group A is leaving. Group As manager is reaching out to me, and is essentially telling me if I want it, I will get it. This will come with a promotion as well (to Engineer 5).

So what do I do?
Go back, get the promotion, and potentially burn some bridges in my current department, and look like a job hopper?

Or stay, and learn all what I can, becoming an expert on all things with this product line (cradle to grave), and become more marketable to potentially get a higher position later?