I am in charge of a Lab that has machines from bench top lathes and mills to extremely large jig bores and lathes that will swing over 86" to CNC mills.

We are a prototype house. We use high speed drill bits by and large. For drilling Titanium or Inconel we might go to high quality Cobalt or even Carbide. This is rare indeed though. As others have mentioned your technique etc will play large in drilled hole quality and bit wear.

If you just drill a lot all the time buy a good quality HSS drill bit set from a good tool crib; not Harbor Freight for example. With the Drill Dr they will last a few lifetimes. Otherwise a cheapy HSS set from HF will suite you quite well; it has me!

Best Regards, Kitz