This is a topic that comes up often and to be honest, you'll get a bunch of different answers as it's mostly a matter of personal preference.
However, here's my take:
Snap on: Flare nut wrenches too include crowfoot, the gold colored heavy duty torx bit sockets.
MAC: the new 90 tooth Axis ratchets, knurled extensions (they have great deep knurling where you need it most, around the female square drive).
MATCO: Pinless impact swivel sockets, ratcheting wrenches (especially those standard length models with a fixed boxed end on one side and a ratcheting boxed end on the other side), their locking flex head comfort grip ratchets, Top Torque screwdrivers.
Cornwell: Their signature item is the coke bottle shaped handle of their age old 30 tooth ratchet. Sadly, i can't think of any other Cornwell tool that is a segment leader.
One important thing to remember is that a truck brand sells service mostly. Pay while you earn credit, truck to bay sales, and a wider selection of tools.
However, many non truck brands have closed the quality gap and are widening offerings. The internet makes most tools quickly available.