Usually the guys doing the polishing can recommend someone to place the concrete. They generally know who does and does not place concrete that complements the polishing to be done.
Tho saying that, some of the coolest polished concrete ive seen has been some of the worst placed concrete ive seen. I do prefer a more random revealing of stones, than the uniform look that reminds me of a shopping centre floor or the cubicles in an old pub toilet.