No one favorite tool brand. It's not marriage, why limit yourself to one? I buy best of breed tools from whoever makes the best tool, or the best value, for me. (That's the "why")
A quick, not exhaustive, and not exclusive list of some of my favorite tools:
Sunex impact sockets
SK chome sockets
Carlyle ratchets
Sturtevant Richmont torque wrenches
Knipex PliersWrench
Xuron electronics cutters, shears and micro-pliers
Bondhus allen keys
Aircat, IR, and Astro Pneumatic air impact wrenches
Lisle and OTC specialty tools