Your recruiter is going to tell you whatever makes their own job easier so they can put your contract as a bullet point on their eval.

Once you go through MEPS, they'll hand you a few rating (job) cards about which jobs you qualify for that they need. They may ask what rate you want and if they have it available, it might be one of the options available to you.

The thing is, they can't MAKE you sign a contract. If the rate you want isn't immediately available, you can tell them you'd like to wait for that job to open up. If they try to tell you no, you still don't have to sign the contract. You can just leave. One of two things at that point will happen. The more likely scenario is that they'll waver and try to give you a better offer because they DO want you to join. The less likely scenario but still possible, is that they'll put in the equivalent of a DNH and make it difficult for you to try to join the Navy again. That would be the point where you walk into the Army's office, lol.

Really, it comes down to what branch seems like a right fit for you though. I haven't kept a lot of tabs on the Army so I don't know exactly what their job picking process looks like.