The good news for you is that we recruited A LOT of Officers post 9/11, many of which were prior enlisted. Many of them are going to be retiring very soon, creating what I would anticipate the best selection rate for officers in the past 15 years. But it is still going to be competitive. I would imagine a 30-35% selection rate compared to what it was 4 or 5 years ago when it was 10-12%. I highly encourage you to do both enlist and complete an OCS package. It looks great when you show up to your interview with that "I am in this regardless" attitude. As an Officer and former recruiter, nothing bothers me more than someone who walks in to an interview thinking they DESERVE to be an Officer and will take nothing less. Not only that, the selection rate for OCS-R (not OCS-T) jumps to over 50% when people are applying from the Enlisted corp. It is not uncommon for someone to get passed up the first time, join, reapply and they are off to OCS 6-12 months later. I had a recruit actually get picked up as an Alternate for OCS while in basic training. At least she showed up to OCS in great shape
Also, we are directed to get those who have STEM Degrees a higher amount of consideration (we don't use the word "preference", but that is exactly what it is)
Best of luck.