I was trained as a watch and clockmaker, and today work as a custom gunsmith. Hence, I have some experience with precision tooling.
For small slotted screwdrivers, there is Bergeon and....Bergeon. Nothing else is even close. Small Phillips and JIS cross-slotted drivers come from Moody. Larger slotted sizes are covered by the superb Grace brand screwdrivers, though the Brownell's interchangeable set is excellent for the money.
Mechanics tools? The only thing I'll say is that Stanley Tool Group (who own ChanneLock, Proto, and other well known brands) used to have a wrench plant in Milwaukie, OR (not too far from me.) I had a friend who worked there, and he says that one day they'd be running the Proto Professional line and the next they'd be running Snap-On. I'll leave it at that, and let you guess which I buy.
(I'll add that I've been very impressed with the Wright line of tools; their wrenches seem to have more precise broaching than any others I've used. If such things are important to you, Wright is the only tool maker whose products are completely made in the U.S. - both materials and labor.)
Measuring instruments: I prefer Swiss brands (Etalon, Compac, Tesa, etc.) whenever possible; their accuracy is unquestioned, and I "grew up" using them.
I do like Starrett tools, with the caveat that anything incorporating a movement (dial calipers, indicators, etc.) is inferior to the Swiss brands. Their mics are very good, though I don't like their spindle lock mechanism (just preference, that's all.) Their #220 multiple anvil micrometer is the best of the breed.
The best source I've ever found for advice on measuring tools is Long Island Indicator; their website is a treasure trove of spot-on advice, and they've never steered me wrong.
Cutting tools are another topic...
-=[ Grant ]=-