COKE or Pepsi? Yankees or Mets? Haim or Feldman? Now you can add one more debate to the great quandaries of determining taste: Trench or anorak? While nothing can trump the utilitarian and storied trench coat, this spring another commonsensical option has exploded over the pages of fashion magazines. With appearances on the runways of DKNY, Dries Van Noten, Vera Wang and other noteworthy designers, the athletic anorak has quickly attacked the streets of New York, and party lines have been drawn. What kind of gal are you?