Hey All,
As a 4th year ROTP civi U student who was rejected from RMC (Math grades stank) I'd like to add my 2 cents. Both are great in their own ways, but I can really only speak for civi U.
Going to a civilian university has allowed me to experience the life of a university student. I pay rent, groceries, phone, cable, gas, hydro, etc and I am responsible for ensuring my financial life is in order (which isn't always easy to do on ocdt pay). Going to a civilian university has allowed me to start growing up! Sort of.
The academic life at a civi U is also under your direct control. I take the courses I want, as long as I take the required courses for my degree program, the military gives me full control. The professors also give you full control of your studies. Go to class or don't go to class. They don't care who you are or what you want to do, they will fail you if you don't complete their course requirements.
You'll also be responsible for your own physical fitness! University gym memberships run pretty cheap, and you can claim it...or so I have just been informed. There are also intramural sports and fitness classes that are relatively inexpensive.
In sum, at RMC, you have a schedule which you must follow. In civi U, you are responsible for making that schedule and following it. It's all up to you in the end, which ever route you choose, the destination is the same.