Thanks for your feedback, and for your continued custom, it's great to have you with us!
The drill bits you've ordered have a larger surface area than the core drills so have more diamond grit and will last longer, but tend not to drill through the material as quickly. Often which bits you choose is down to personal preference and each can perform differently on certain materials. For instance, I personally like to use these drill bits on stone, but the core drills for glass and sea glass. Again, thanks for sharing your thoughts, we really appreciate you taking the time to respond.