Square give you more flake in a given area because we do not cut the corners off which gives us more "visual pop". Note on flake sizing. 0.015 can be sprayed out of most 1.7 tip spray guns, 0.025 a 2.0, and for 0.035 you will need to use a dry flake gun, cheese shaker (if a smaller project), or a large tipped gun such as a 2.5 to a 3.0 if available.