I like carbide drill bits for abrasive applications like production runs in plastic. I've never had much use for them in steel.
What's wrong with your O1 that a regular quality cobalt HSS bit doesn't work?
I've seen tin coated bits that were real junk so that gold coating doesn't mean anything. Look for American made HSS bits and you should be fine unless the work piece is hardened.
Unless you're doing lots of hundreds of parts at a time, a regular black oxide HSS is all you want for steel. I can get several hundred holes in D2 with a $3.00 bit.