Brother! would you want to be a CSP or an AD? decide yourself it shouldn't be a difficult decision. And you may know better about the perks and privileges of Postal Group. Now i would say, to be a CSP is way better than an AD, be it a Postal or any other group.
Good luck and Congratulation.

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"Whomever Allah guides, no one can misguide, and whomever Allah misguides, no one can guide." Al-Qura'an.