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We've been using them a bit at film school.
A and B are two default modes. One is for daylight scenes, i.e. if you're filming during the day. The other mode is tungsten mode. This is if you are either a) filming inside under light bulbs or any other in-house lighting, or b) doing any night scenes.
PRST is if you want to do a manual white balance, i.e. stick a white card up to the camera. The card will tell the camera to correct it's colour settings based upon the colour it's seeing. Of course, a brown card or a dirty white card will give a different exposure. You need a plain white card.
I've been told it's best to just select A or B, depending on where you are shooting and the camera will take care of the colour balancing on it's own. If you're shooting at one particular location and the original look of the colour changes all of a sudden (i.e. becomes too blue or too orangey), you can always manually white balance to fix the colours again. Most of the time you shouldn't have a problem using A or B, providing the lights themselves are correctly colour-balanced with the correct gels, but that's another story... So use A or B, and if in doubt, use PRST.
In addition, you can also balance through colored gels if you want to get some artistic expression in your look by placing them infront of the camera when executing the WB.To get nice looks, you can blue, red, yellow, or what ever light color you can find balance your camera....So if you white balanced your camera infront of a purple subject, you will get a greenish look. NOW, if you just want plain footage, white balance y our camera, and you can always do the color correcting in post. Good Luck