I graduated from the Corps of Cadets at Texas A&M many years ago. I've been in the Marine Corps ever since.
The two are completely different.
That said, I enjoyed it, learned a lot, and had a great time.
The things I learned at A&M in the Corps of Cadets that directly helped me (to varying degrees) in the Marine Corps are as follows:
1) Teamwork and accomplishing a cumulative effort. (Big help)
2) How to follow/work for somebody that is either a total asshole or has no idea what he's talking about...... or both. (Very helpful at OCS/TBS, but only helps dull the pain since then)
3) Preparation for USMC OCS. (EXREMELY helpful. Lots of PT and access to the same challenges...drill instructors, obstacle course, weapons handling, gouge, land nav, etc)
4) Discipline. (helpful, mostly because I made a ton of mistakes that would have had more serious consequences if I was actually in the military)
5) A better sense of honor (a little helpful, since by the time you're 18 you should have SOME idea not to lie/cheat/steal instilled by your parents. What helped was how it showed me how important your personal honor is to your job as a leader)
6) Study habits. (Helpful, but I should have learned them better anyway. I would have failed out if it weren't for the Corps of Cadets. I had ZERO study habits before)
7) How to eat really fast. (Again, very helpful at OCS, but is rarely a talent I need much anymore)
8) How to polish shoes/boots. (see above for helpfulness)
If you're looking for a place that will turn you into the next Chesty Puller, you won't find that at any one place. If you're looking for a place that will give you some kind of edge at flight school or getting into the flight program.....I don't think it exists.
Some other things that I "got out of the Corps of Cadets" but didn't directly affect my life in the real military:
1) Some of the best friends I have.
2) A lot of character building moments.
3) A lot of fun and some of the best experiences of my life thus far.
Being in the Corps of Cadets was great for me. It fit my needs and suited my personality. I would recommend it to you, but only if you transfer as a fish and go all the way through it. The fish year is hardest, but that's where most of the best parts are. Don't be one of those clowns who transfers and skates out of fish year. It's rare, but they never truly fit in.
Having said that, A&M and the Corps of Cadets has not by any means cornered the market on military leadership training, education, or the college experience as a whole. Not even close. It's a great school with a rich tradition and history, but so are a great many other schools and student activities that do similar things in much different ways. You could learn all of the same things that I did in a different way and in a different place.
If you want some (somewhat) unsolicited advice, I'd say either do it (or don't) because of what you want to learn and experience. College is your way to learn a ton of lessons both in and out of the classroom and make it to the next level. I did it at A&M. YOU do it for yourself. If you decide NOT to transfer or join the Corps of Cadets, that's fine if that's what best suits you. Just don't avoid it because you're scared of it. It's hard, but it's not THAT hard. It's minimal compared to USMC or USN OCS. Minimal. If you can't make it in the Corps of Cadets, you'd never in a million years make it through OCS. One thing I always did when I was about to do something intimidating (OCS, solo, Carrier Qual, SERE, etc) is to look around for somebody who'd already done it and ask myself, "If he did it, why can't I?" You'll always find somebody smaller/weaker/dumber/less motivated around that made it through whatever you're about to to. If he can do it, so can you.
What you're in now is nowhere near the same as A&M College Station and the Corps of Cadets. No offense there, it's just the truth. You might visit the Campus and the Quad and look around. They even have a "spend the night with the Corps" program for HS seniors so that they can see some of what's in store for them. Not sure if they do it for transfers, but you can always ask.
TAMUG is a good school, but it's totally different. It's the same for any of the "branch campuses" out there. Going to UT Arlington is NOT the same as going to UT Austin. You'd think that something so simple would be easily understood, but it's not. I hear "Hook Em Horns" from a ton of assclowns who went to UT-A/UTSA/UT-Guapdalupe community college. Whatever. It's not the same.
I've served with, for, and in charge of graduates of many, many universities. The Aggies that rank among them all are over the page. Some were great, some not so much. Some of the worst leaders I've known went to USNA (and definitely some of the best). Some of my most admired leaders went to the likes of Chico State, Coe College, and Salisbury State. I never even heard of those schools until I met them.
College matters, but it's what you do with what you learn that really counts.
PM me if you have any particular questions.