With Both you can go as high as you can (Generals) as both are permanent commission and nature of job is same but as PMA Longcourse is a regular commission then Chances of Promotion are slightly higher than GC as they have a got a proper military training for 2 years instead of 1 Basic Military...
Usually PMA LC is after fsc and GC course is after graduation...
PMA LC is a two year training program whereas GC is 1 year training program..........GC is a fast track course...
Sorry you cannot apply for armed forces...It is due to fact that a Person with knee Knocking cannot Run faster and cannot do Parade...Google for solutions