Wine may be fine and let’s hear a cheer for beer, but if you want to be “on trend” in the New York bar scene, make whiskey your cocktail of choice. This fall, the city is overflowing with the stuff as several new or renovated hotel bars are packing their menus with single malts: There are 120 options at Reserve in the Morgan’s Hotel; 50 U.S.-distilled labels at the Whiskey Bar in the SoHo Grand; and a master mixologist from England who knows his whiskies at Henry, the new bar at The Hudson Hotel.