What are the differences between black oxide and titanium coated drill bits in terms of performance and durability?

Black oxide drill bits are coated with a black oxide finish that provides some corrosion resistance and lubrication, but they are not as durable as titanium-coated drill bits. Titanium-coated drill bits have a harder surface that increases their durability and heat resistance, making them better suited for drilling through harder materials. In terms of performance, titanium-coated drill bits generally last longer and provide better results when drilling into tough materials compared to black oxide drill bits.