I'm amazed the Bosch daredevil spade bits are as cheap as they are, considering how well they hold up.
I use cheap Ryobi twist bits (found them clearance for $4 at a HD which usually has the kit at $10, bought them out) and although they don't stay as sharp as my DeWalts, still were a great value.
I am a big fan of Greenlee's unibit, and still have one from over a year ago before Lowe's decided it hates electricians.
Masonry bits are all Bosch, and impact bits are DeWalt. I love my Milwaukee power tools and sawzall blades, but had a bad experience with their shockwave "impact rated" bits and will never buy Milwaukee bits again.
Had a great US made Klein carbide cutter, and tried to replace it with a Taiwan made bit, it is junk.
Always had good luck with Lenox hole-saw bits.