The best American English, as far as being grammatically correct is concerned, is spoken in New England. If you wanted to pin it down further, Yale English spoken in New Haven, Connecticut, is the absolute best.
As far as being easy to understand for a foreigner is concerned, California English may be the best because California has so many foreigners, so the language is flattened and dumbed down a bit. Boston English may be harder to understand because of the accent ("I pahked my cah in Hahvid Yahd"), but grammatically it is better.
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