Army or marines ???????

i have been wanting to join the marines for about two years now but in those 2 years the marines never helped get deped in or any thing of that sort lol so i got irratated and went to the army recruiiters office and they already sent to get my phsycal and everything but i jus cant get away from this felling that i want to become a marine i could see myself in the army but my gut felling says marines !! so what advice to me ! the army garrantees me the mos but in the marines i would have togo open contract so thats the big issue with me i want to know what im goin tobe doin but in the marines i wouldnt know that !! so whats ur advice