The best triangular drill bit for most applications is the TiN-coated carbide bit. This type of bit offers superior durability, heat resistance, and cutting efficiency compared to other materials. According to a study by the National Institute of Standards and Technology (NIST), TiN-coated carbide bits can last up to 50% longer than high-speed steel (HSS) bits and can reduce cutting temperatures by up to 30%. This extended lifespan and improved performance make TiN-coated carbide bits the preferred choice for professional and DIY users alike.