Indubitable that MoD and FGO are prestigious organizations, being there is dream.But some people left AD MoD/ AD FGO when allocated in PMS-12&14. Being PMS there is more horizontal and vertical mobility as compared to MoD and FGO,however one's personal preference also does matter and some PMS-12 officers even recommend foreign funded PhD and University lectureship as better options with a rationale that being PMS 37K starting salary, all the day long files even at home while being lecturer(BS-18) rapid promotion, foreign visits, research grants, remuneration for evening classes etc. etc. while being in services, they do benefit with due favour to friends and family but their own life is full of hardsships.
There are always better options.