I want to change over to pebble tec. Which type is finer in grit the sheen or fina? Has any one in this forum have the luminus finish. I heard it reflects colors. How is the price for luminus?

Also, what do you look for when hiring a pool contractor to refinish a pool. I had estimates by 3. 2 had the same opinion using plaster with pebble tec. 1 said plaster is not used in pebble tec. I am sort of stuck in a way.