What is the merits and drawbacks of the websters dictionary in comparison too the oxford dictionary?

I need to know with some reference to specific words defined in each dictionary what are the differences between the oxford and the websters dictionary.What is the merits and drawbacks of the websters dictionary in comparison too the oxford dictionary?
The Oxford dictionary is the dictionary of the English language, as used in the United Kingdom, which differs somewhat in pronunciations, spelling, and has different words than "American" English.



the Webster's dictionary concerns itself with American (English) words, pronunciations, and spellings.What is the merits and drawbacks of the websters dictionary in comparison too the oxford dictionary?
The Oxford English Dictionary is vast (20 volumes), and covers word usage and spelling " from across the English-speaking world, from North America to South Africa, from Australia and New Zealand to the Caribbean."

It provides the history of the words, with dates and examples of first usage etc.

http://www.oed.com/about/



Most dictionaries only provide current usage.