Well which one is more proper?

Mum vs. Mom
Harbour vs. Harbor
Colour vs. Color

Centimetres vs. Inches?

English >>>>>>

I prefer English.

Well, British English is more proper by default, cause it's their language and they don't need foreigners to tell them how to speak their own language.

Anyway, Harbour & Colour

I prefer British English spelling. It tends to make more sense.

I prefer AE spelling in most cases.

Centimetres >>>>>>

I like American

I don't get why our measurement system is different that everyone else though.
One of my teachers in elementary school told us it was based on the size of some English King's foot .

It really depends on the word.

I actually like the British spelling more even though I'm American.

And neither is more "proper" since both countries have different standards of what proper is

I see someone is not a fan of cultural diffusion.

English.

Lets not forget the Celsius vs. Farenheit.

How do Canadians spell them?

Well, no, he just asked which one is proper

british is the correct way to do it

You measure your dick in inches, so #TeamAmerica

British English spelling is more classy and sophisticated.

I mean, Theatre, Centemetre.

Oh, and RUBBER

Canadians use the British spelling sooooooo.... that. lol