I used a sliding door on my coop. The door is built out of OSB and 2x2's. I used a pocket door kit and auxiliary rollers on the bottom (no track) with guides to keep the door against the wall. The bottom of the door is off the ground about six inches and there is a blocker in the opening to keep the shavings inside. I clean up any shavings that fall down every few months when I clean the coop.
The door works great, it is very heavy (+/- 50 lbs) but opens with one hand, and is VERY secure when locked. We used a sliding door because we did not have room for a swing door. Given a choice, I would build it the same way again, easy to open a little or a lot, doesn't get caught by the wind, and no hinges to sag, or handles to turn with wet gloves. The pocket door kit was about 35 bucks I think.
You can see the door on my page, there are no pictures of the rollers on the bottom but I could grab a few if you want.