Using a standard fitted white pad might give you an edge. Even if it isn't required, it would make you look more turned out, and judges like that. But if you do go with an AP, I'd pick a solid color that isn't too bright, maybe a hunter green or navy blue, something that won't scream "look at me!" unless you want them to see every little error you make. They wouldn't be able to help having their eye drawn to a bright color or pattern, and that's not always a good thing.
"Keep a leg on each side and your mind in the middle"