Hi,
I can only answer from being a consumer of tools, customer of tool vendors and brands. Matco is a fine company with extremely good product, if a bit expensive. In an area where they are not represented or under-represented, they will likely grant you an area that is larger than you can easily cover to make sure that you can make a living and more with your own effort.
Mac seems to be good, though not a flexible. Snap-On seems to be more restrictive still, defining territories more because of name recognition. Know little of Cornwall, SK or independents.
Matco seems to have the most advanced toolboxes in the industry.
All are pricey, but they offer some parent company backing.
Suggest a corporate identity with a DBA attached for business structure.
Peace,
Clarke