My favorite set of hex wrenches includes all of:
A full set of T-handle hex wrenches (brand does not matter)
A full set of socket hex wrenches (brand does not matter)
A full set of screw driver hex wrenches - or - screwdriver handle with full set of hex bits (brand does not matter)
A three way 2-2.5-3mm hex tool (brand does not matter)
A three way 4-5-6mm hex tool (brand does not matter)
A hex multi-tool (brand does not matter)

Hope this helps