Hokay, so I've decided on it being the Normandy
Annyways, while the Normandy
would play a role in colonizing a world (Survey operations, etc), sitting around and establishing a colony is kind of outside the mission profile - it would ground the ship for so long when it could be useful for other things.
A dedicated colony ship ought to be inexpensive, constructed with robust and proven technologies (making repairs easier, making it easier to get replacement parts. easier to build), carry many many more passengers, and be less heavily armed (the torpedoes, SFB-style drones, and motorpool on the Normandy
take up a lot of space)