All economical concerns aside, becoming an Army pilot before pursuing a civilian career as a commercial pilot has distinct advantages over attending a civilian flight school.

-You won't have to worry about financial aid and living expenses while you're in school (and the substantial debt load you could end up carrying after graduation if you aren't able to cover those expenses).
-You'll be able to add several years of professional experience in your resume, an opportunity most civilian flight school graduates won't have.
-Some employers offer veterans' preference, giving you an additional edge over other candidates.
-Most employers realize that individuals who served in the military will be hardworking, highly valuable additions to their teams regardless of whether or not their company offers veterans' preference.

As a veteran myself, I understand how appealing the "easy" (civilian) route is, but I would recommend utilizing your Army benefits to gain the education and experience that will make you highly competitive in the civilian job market after your enlistment is up.