Went to order travertine coping, and learned we can get it in either 12x12 or 12x24 sizes, with price being exactly the same per foot. We have geometric pool and spa. My initial instinct is bigger is better so there will be fewer joints, but whichever size we go with will still require cutting some pieces to go around each 90 degree and 45 degree angles. I'm not sure if the small corner cuts will blend in more if we use only 12x12 on the long runs between corners or if it will matter at all. Decking will be the same travertine in a 4 piece French pattern. Any opinions on whether to use 12x12 or 12x24, or a mix of both?