I've used Chapman for over 40 years and don't see any reason to change at this point. I like that I can get more slotted sizes or replacement bits for $1.50 or so. Since replacement bits are cheap, it is not a big deal to modify one for a special application. The other thing I like about Chapman is that they are still a tiny Mom and Pop shop (~20 people) after 80+ years, and I like to support small US businesses.
https://chapmanmfg.com/
https://chapmanmfg.com/