Very interesting read, i knew Americans and English language varies in that, some words are different or mean the same thing just spelt differently. For example colour is English and color is American.
Very good table too.

Because I read a lot of British writers when I was young, I tend to favor British/Canadian spelling for some words. Going down your list, I'm probably 15% Canadian

Mostly people give priority to American spelling for such words as "color" instead of listing it under the Canadian spelling of "colour." Some people say to just use a British dictionary; however, Canadian spelling is different in many cases.You had done nice comparison.

Not surprisingly, Canadian English is pretty close to British English. Increasingly (alas, I'm English) US English = International English so, unless your market is NOT international I regretfully recommend you stick with US English.

Well, brutal honesty compels me to note that far too many people can't spell very well anyway, so in practice you can probably mix and match as you please

I had never considered how these discrepancies in spelling might effect a markets entire perception nor that the differences between Canadian and American spelling were so great.

This table interests me because as someone from the United States, I personally use some of the spellings from the Canada column rather than the US column, especially in the case of matte and grey. Grey is a word that I've seen spelled both ways, but I have never seen matte spelled without the E.

Awesome list. I've always wondered home many of these differences exist. This is a great resource. Thanks.

Although I'm English, I wish that someone would modernise (or is it 'modernize'?) the way we spell. It is so silly that here even we can't get to grips with license and practise being verbs and licence and practice being nouns. And why the silly 'u' in words like colour and favourite? We even put double L in things like travelled when travel has only one! No wonder foreigners find it hard learning English, when we struggle to learn how to spell ourselves.
With the internet demolishing international boundaries, I favour a single, standardised English. If this were based on logic and usage – despite being proudly British! – I would have to go with the U.S. version.