Finding the best tools is not the goal here. Otherwise go Hazet or go home.
Parktool is regarded as best tools manufacturer for bikes, and they are for sure fitted for the task and last well in every day use in a shop... no question about it.
But i can assure that a parktool is no match for most of the pro tools used in industry like names mentioned above. (i'm afraid to use those tiny Park T-handled inbus on an injection pump head with 8mm inbus bolts torqued to 250Nm but no problem for stalhwille)
I can't vouch for snapon.. i only have some old tools of them because snapon are a rare bird to see in Europe. And as you said, in top tier tools is more about marketing and warranty and other stuff.
Park's hex and torx keys are made by Bondhus, who make world class tools. They're up to serious use.