I have a LOT of similar problems like you. I'm also an international student.
Okay let's start from here:
What do you WANT to do? As a career? FMM is for people who want to be buyers or work as merchandisers or anything in that director. Communications is for advertising, PR
, magazines, etc. So they're very different and you need to know what exactly you're wanting to do. FMM for example, involves tons of math and communications, lots of writing! FMM is highly prestigious because FIT is the best program in NY for fashion merchandising. I'm not sure what the rep of communications is but I'm sure it's great as well.
Also, you can't do an AAS in FMM and then do a BA in AMC. You have to pick the same course, it's the FIT rule.
Hope this helped! I'm sure you'll do fantastic.