Which MOS is most likely to deploy, 15P/Q or 35F/S or 25U?

I would not try and game this. Pick something you’re interested in and could do well with. Look at units close to your school/home.

No true telling honestly. Good rule of thumb is to expect to be deployed regardless of the MOS.

To piggy back on what SSG Livingston mentioned in his post, while it does depend on the deployment cycle it will also depend on the OpTempo of your unit that you join. If you go 35 series and don't want to deploy I would suggest not joining an intelligence command structure, specifically the MIRC because they have MOBs come out every year and often times the units cannot fill them organically so they get other Soldiers to augment their mission (usually on a voluntary basis). Also, depends on the policy of the government at the time. With their being an intention of troop draw down in certain parts that could play a factor. At the end of the day, the only ones that could tell you the likelihood of deploying with a unit is the folks at that unit. It isn't always necessarily dependent on your MOS.