I got a 99 on my ASVAB, what MOS or branch would be a good choice?

Those CAN'T be your ONLY job choices. They're just trying to fill up their harder billets. The best advice is: Do what you WANT to do, don't let them bully you at MEPS into a job you don't want. If you have a 4-6 year contract in the military doing something you don't like, you'll hate life for 4-6 years. None of us know what you truly want to do, so this is a question you can only answer yourself. Do what makes you happy.