The preferred diamond drills are sq. drills. They seem to be favored by about 70% of diamond painting lovers. But most will do a diamond painting in both form of drill. So definitely it is actually up to your 5D diamond painting artist. Diamond Painting Ornaments: Diamond painting types https://diamond-painting80012.livebloggs.com/32948602/5-simple-statements-about-diamond-painting-accessories-explained