I'd say the one from England, considering that's the origin. It's what all the other English variants are the closest to. American English is probably the one that's deviated the most from it, but is the most widespread because a lot of things come from America.
"The differences between American and British are not due to Americans changing from a British standard. American is not corrupt British plus barbarisms. Rather, both American and British evolved in different ways from a common sixteenth-century ancestral standard. Present-day British is no closer to that earlier form than present-day American is. Indeed, in some ways present-day American is more conservative, that is, closer to the common original standard than is present-day British."