Ain't nothin wrong with a pair of Doc Martens. they last a good long time, and are really comfy once you get them broke in.
As far as Corcorans, it depends on which ones you get. I had three flavors when I was in the Army:
1. Original jump boots. they look the best of all of them, and take and awesome shine. On the down side, they are very hard when new, and take a while to break in. Very comfortable after you get them broke though. No lug soles. These are pretty smooth. Good for walking around in garrison and on the parade feild or classroom.
2. Feild boots. Much like the jump boots, but with much softer uppers and a padded collar. They break in almost instantly, and have a lug sole for traction. they don't shine up near as nice as the jump boots due to the softer upper, but the toe cap and the heel cup are the same hard leather as on the jump boots, and shine as well.
3. Same as feild boots, but with canvs uppers, and hard leather toe cap and heel cup. I got them from the AF clothing sales shop, and was told by them that they were not authorized for Army troops, and they would not sell them to me. I pitched a good long bitch that all of Ramstein AFB heard, and they relented and sold me the boots. I wore them for over a year until I left the Army, and nobody ever bothered me about them. This was by far the most comfortable pair of the three.
These were all from about 5 years ago, and they cost between $120 and $150.
Hope this helps.