To buy the British Edition または American edition?... HELP!!!

I have read the UK edition of harry potter about one hundred times. We are Australian.

My brother now wants to read them. he is 11 years old and I want to buy him a boxed set. The childrens edition boxed set is white and (i believe) makes the book look boring.

I have found an American Edition boxed set and the artwork on the book covers and the box looks fantastic and will really draw the attention of an 11 年 old.

I know to not judge a book によって its cover but an 11 年 old doesnt think the same way.

My biggest issue is the difference between the books. Has anyone who is not american found any confusion between the editions. I want my brother to enjoy the 本 as much as i do but i am concernced about the difference in the editions.

I know words are slightly different but is the 全体, 全体的です effect different?

please help...