/lit/ - Literature

What is logically more sound in grammar? I'll give an example of some of the differences.

have/take
UK:
>I'm going to go have a shower
US:
>I'm going to go take a shower

shall/will
UK:
>I shall arrive around noon
US:
>I will arrive around noon

to/
UK
>I will make sure to write to you
US
>I will make sure to write you

There are probably more important differences that I'm forgetting.

Often times in books when there is dialogue, I notice that British authors will tend to use '' instead of "" when quoting. Why is this, and which way is better?
e.g.

'O, I am slain.'
"O, I am slain."

>live in Tucson for 18 months
>fucking library sales all the time all over the city for some reason
>go and find all of the classics I could ever want for ~$1 a piece
>carry 20-30 hardcover library books in my backpack while riding home on my bike
>filled a bookshelf with classics for a negligible amount of money
I have a kindle and used to read it a lot, but I prefer books.