In my personal experience bigger roots = bigger buds even in coco. Many will argue you only need a x liter pot.. The more space for your roots to grow the more potential for the plant above ground to grow, including flowers.
Just note with RDWC you're going to want to have an air pump in a cold room or near a cold air duct and a good water pump to really move the water through all the pots sufficiently. If your air pump is in your 80 °F grow room the water is not going to be at an ideal temperature especially already warming up from the recirculating pump running 24/7. Prepare to look into Chillers and microbes or pool shock, you can't use one with the other.
The systems by Current Culture and Alien have been already designed for you to work perfectly.