I've used and own a fair amount of "Proto" tools, there almost indestructible. Most of their ratchets are rebuild-able and easily serviced. Sockets are on the thick side, i.e. their chrome sockets look like they're impact sockets.
Danaher makes a "LOT" of different brands, i just usually don't like the "feel" of armstrong tools, although i'm sure there great tools. I have some KD sockets and armstongs are noticeably different is some areas though outside dimensions are the same.
Snapon makes great hand tools, but some of the things that they make, just aren't worth the money paid. I would never buy snapon brand air tools or cordless tools. There great tools, no doubt, i would probably own some of their ratchets, if i didn't already have like 3 or 4 duplicates of every size i use.