TLKY:
Neither Yankees nor Southerners have it wrong.
The German “ow” versus the ashkenaz “oh”, for example, can be described as a different dialect and neither is any more correct than the other as they are essentially the same.
But when it gets to an “oy” instead of “oh”, and “yuntiff” instead of “yom tov”, and vowels being completely switched around (and perhaps even in the case of a kamatz being practically erased as a distinct vowel from patach), it is long past being considered a different dialect.